Overview

1. Q: What are the key features of the Xiaomi Watch S4?

A: The key features of the Xiaomi Watch S4 are as follows:
1. Upgraded versatile bezel 2.0+: Supports customizable bezel and strap sets, unlocking exclusive functional watch faces for a personalized experience;
2. Enhanced design and quality: Features a refined PVD high-gloss body, an elegant stainless steel rotating crown for more efficient interaction, and bezel markings that exude sophistication;
3. Comprehensive sports and health monitoring: In addition to all-day blood oxygen saturation, heart rate, and stress monitoring, it supports advanced sleep tracking, including sleep respiratory health risk assessment and sleep breathing rhythm analysis. The self-developed heart rate algorithm provides more accurate recording;
4. More powerful AI capabilities: AI-powered running route planning makes running more engaging and personalized;
5. Upgraded professional workout modes: Supports over 150 workout modes, running posture analysis, intelligent training plans, enhanced ski-fall detection algorithms, and emergency rescue at nearby ski resorts;
6. Compatibility and communication: Supports dual-mode communication via network and Bluetooth, ensuring seamless connectivity in all scenarios, whether online or offline. Real-time communication for group outdoor activities enhances teamwork and safety.
 

2. Q: What are the appearance, materials, and structure of the Xiaomi Watch S4?

A: The details of the Xiaomi Watch S4 are as follows:
1. Dimensions: Diameter of 48mm, thickness 12mm (excluding DECO and heart rate sensor) or 14.13mm (including heart rate bump, excluding DECO);
2. Weight: 45.5 ± 1g (excluding strap);
3. Display: The Xiaomi Watch S4 is equipped with a 1.43-inch AMOLED round display, offering a resolution of 466 × 466 with 326 PPI;
4. Glass cover: The watch features a durable Panda Glass cover;
5. Middle frame: Made entirely of aluminum alloy for lightweight durability;
6. Bezel: Constructed from stainless steel;
7. Buttons: The 2 o’clock position houses the function button/rotating crown. The 4 o’clock position features the power button for additional controls.
The structure and accessories of the watch are shown in the diagram below:

 

3. Q: What are the application features of the Xiaomi Watch S4, and how can the APP layout be switched?

A: The Xiaomi Watch S4 comes with the following pre-installed applications: Workout, History, Stats, Training State, Heart Rate, Vitality Score, SpO₂, Sleep, Events, Stress, Breathing, Cycles, Mi Home/Xiaomi Home, Weather, Cards, Calendar, Tasks, Contact, Phone, Recorder, Music, Settings, Camera, Alarm, Stopwatch, Timer, World Clock, Barometer, Compass, Flashlight, Walkie-Talkie, Find Phone, Calculator, and more.
To switch the APP layout, please refer to the following methods:
1. On the watch: Press the rotating crown to access the APP list >> swipe up or down the screen or rotate the crown to the bottom >> select [Layout] to switch. Alternatively, press the rotating crown >> enter [Settings] >> [Home screen] >> tap [Layout] to switch;
2. On the Mi Fitness APP: After connecting the watch >> enter [Device] >> select [System] >> tap [App layout] to make the changes.
 

4. Q: What are the differences between the Xiaomi Watch S4 and the Xiaomi Watch S3?

A: The Xiaomi Watch S4 increases network + Bluetooth walkie-talkie functionality and offers a wider range of customizable watch faces and APP features.
For more detailed differences between the two watches, please refer to the comparison below:

	Xiaomi Watch S4	Xiaomi Watch S3
Interchangeable Decorative Bezels	Features the upgraded versatile bezel 2.0 with optimized materials and functionality. Adds fall reminders, inbox bezels with chamfering, and scale decorations.	Switching Deco provides vibration, sound, and animation notifications, with the option to change the watch face.
Screen	1.43" AMOLED display with improved luminous materials, upgraded brightness of 2200 nits, and anti-wet touch functionality.	1.43" AMOLED
Screen Brightness	Global brightness of 1500 nits and peak brightness of 2200 nits in sunlight mode, enhancing outdoor visibility.	Global brightness of 600 nits. Sunlight mode is not supported.
Middle Frame Material	Aluminum alloy with PVD coating.	Aluminum alloy with anodized finish.
Walkie-Talkie	Supports both network-based and Bluetooth walkie-talkie functions.	Not support
Health Function	Self-developed heart rate algorithm with an average heart rate accuracy of 98.2%; Research on sleep apnea risk; Breathing training 2.0, supporting multiple breathing techniques.	Twelve-channel heart rate monitoring module; Average heart rate accuracy: 97.75%; Sleep monitoring accuracy improved by 15%.
Sports Monitoring	Ski mode 2.0 with fall detection.	Ski mode 1.0

 

5. Q: Will wearing the Xiaomi Watch S4 cause allergies?

A: The Xiaomi Watch S4 is made from professional health-friendly and eco-friendly materials that have undergone allergy testing by certified institutions. Parts that frequently come into contact with the skin, such as the strap, back cover, and buttons, have passed strict inspection for allergy-prone and harmful substances. However, due to individual differences, you can experience discomfort or reactions to specific materials or the red and green light emitted by the sensors. If you experience skin discomfort while wearing the watch, discontinue use immediately and consult a doctor.
To ensure a comfortable wearing experience, follow these guidelines:
1. During exercise, avoid wearing the watch too loosely or too tightly, ensuring it stays in place without sliding up or down your wrist;
2. For daily use, slightly loosen the strap to allow the skin to breathe for a more comfortable experience;
3. After prolonged wear, remove the watch to let your wrist rest for about 30 minutes;
4. After exercising, clean and wipe off sweat from your wrist and the strap, then let it dry before wearing it again.
 

6. Q: How to replace the strap on the Xiaomi Watch S4?

A: The Xiaomi Watch S4 supports quick-release straps.
Follow these steps to replace the strap:
1. Removing the strap: Push the spring bar in the strap downward in the direction of the strap to release it, and then remove the strap;
2. Installing the strap: Insert one end of the spring bar into the designated hole on the watch lug. Press the other side of the spring bar downward and guide it into the opposite lug. Gently move the strap until you feel the spring bar snap securely into place;
3. After installing the strap, pull gently on it to ensure it is securely attached.
Note:
The spring bar is a steel rod that connects and secures the strap to the watch case.
 

7. Q: Are the Xiaomi Watch S4 straps compatible with previous models?

A: The Xiaomi Watch S4 features a strap width of 22mm, making it compatible with any watch that supports this strap width.
 

8. Q: What is the charging cable of the Xiaomi Watch S4?

A: The Xiaomi Watch S4 uses a standard wired charging dock (with cable), identical to the one used for the Xiaomi Watch S3.
 

9. Q: What is the water resistance rating of the Xiaomi Watch S4?

A: The Xiaomi Watch S4 is rated 5ATM water-resistant (equivalent to a depth of 50 meters underwater). It can be worn during pool swimming, shallow water swimming, and other water activities in shallow areas. However, it is not suitable for hot showers, saunas, or diving. Additionally, avoid direct impact from high-speed water flows during water sports. Water resistance is not a permanent feature and can diminish over time.
Note:
The 50-meter water resistance rating refers to the watch's resistance to water pressure under standard conditions. These conditions imply a stationary state where the watch can withstand a certain level of water pressure. This pressure level is not derived from actual underwater measurements but is calculated based on atmospheric pressure. A 50-meter water resistance rating means the watch can withstand the pressure equivalent to 50 meters of water depth in a stationary state.
 

10. Q: Does the Xiaomi Watch S4 support independent satellite positioning? What positioning systems does the watch use?

A: The Xiaomi Watch S4 supports independent satellite positioning.
It features dual-frequency positioning and supports five satellite systems: China’s BeiDou Navigation Satellite System (BDS), the United States’ GPS, the European Union’s Galileo (GALILEO), Russia’s GLONASS, and Quasi-Zenith Satellite System (QZSS).
 

11. Q: How to install and remove the bezel of the Xiaomi Watch S4?

A: To install and remove the bezel of the Xiaomi Watch S4, please refer to the following steps:
1. Place your index finger and thumb on the side edges of the bezel at the 6 o’clock and 12 o’clock positions respectively, or press your palm flat against the bezel. Rotate counterclockwise with force at an angle (approximately 20 degrees) until it can no longer move;
2. Pinch the bezel vertically upward with both fingers to remove the bezel component;
3. Take the replacement bezel component and align the solid alignment point on the inside of the bezel with the hollow alignment point at the 12 o’clock position on the watch body. Place it horizontally onto the watch body until it clicks into place;
4. Place your index finger and thumb on the side edges of the bezel at the 6 o’clock and 12 o’clock positions respectively, or press your palm flat against the bezel. Rotate clockwise with force until you hear a ‘click’ sound, indicating that the bezel is securely installed.
As shown in the illustration below:

Note:
1. If the bezel is not aligned with the positioning marks during installation and becomes stuck, preventing rotation or removal, pinch the sides of the bezel firmly with your fingers and lift it vertically to remove it (refer to the image below);

2. Charging or a strong magnetic environment does not affect installation or removal.
In daily use, the bezel can occasionally be difficult to remove under the following scenarios:
1. If the bezel is new and unused but difficult to remove, it is recommended to wrap the bezel with a tissue or a thin glasses cleaning cloth to increase friction for removal. If it still cannot be removed, please contact after-sales support for assistance;
2. If the bezel has been used regularly, with repeated removal and installation, start by wrapping the bezel with a tissue or a thin glasses cleaning cloth to increase friction for removal. If the bezel is removable but difficult to detach, clean it using a cotton swab dipped in alcohol to remove any debris. If the bezel remains stuck and cannot be removed, it is advised to contact after-sales support for assistance;
3. If the bezel becomes difficult to remove after heavy sweating, due to the design of the bezel's detachable structure, gaps can exist between the bezel and the watch body. After intense exercise and heavy sweating, it is recommended to use a cotton swab dipped in alcohol to clean sweat or dirt from inside the bezel to prevent the accumulation of sweat salts that can hinder smooth removal and installation. If the bezel still cannot be removed, please contact after-sales support for assistance.
 

11.1 Q: Is the new bezel of the Xiaomi Watch S4 compatible with the previous generation?

A: The Xiaomi Watch S4 bezel is structurally compatible with the Xiaomi Watch S3. However, it cannot fully trigger the exclusive watch face features. When the Xiaomi Watch S4 bezel is installed on the previous generation’s device, it can only activate the corresponding special watch face styles designed for the previous generation’s bezel.
 

11.2 Q: Why does the Xiaomi Watch S4 keep vibrating and won't stop after the bezel is removed?

A: To prevent the bezel from being accidentally lost, when the bezel is removed, the Xiaomi Watch S4 will vibrate and display a "Bezel has been removed" reminder, as shown in the image below.

If you want to exit the vibration mode, press the rotating crown or the power button on the watch, or tap/swipe the screen.
After exiting vibration, there are two display scenarios: before and after the first three removals.
The display scenarios are as follows:
1. First three removals (New device/Factory reset):
(1). The first time the bezel is removed and vibration stops, the reminder page is illustrated below;

(2). The second and third time the bezel is removed, the reminder page is illustrated below;

(3). The installation guide animation is shown in the image below;

2. After the third removal:
After the third removal, no reminder message will be displayed. After exiting vibration by pressing the button or tapping the screen, the watch will return to the previous page.
 

11.3. Q: How to install the Xiaomi Watch S4 bezel?

A: During the first three installations, the prompt "Did you hear a beep" will appear to confirm whether the bezel is properly installed. If you tap [Yes], an animation for switching the bezel and a watch face confirmation popup will appear (installing the bezel will trigger the switch to the corresponding watch face). If you tap [No], the installation guide animation will be shown.
After the third installation, the switch animation and watch face confirmation popup will appear directly.
 

11.4. Q: What is the correspondence between the Xiaomi Watch S4 bezel and the watch face?

A: When installing, the bezel and the watch face are correspondingly matched. The installed bezel will trigger a corresponding watch face confirmation popup.
The specific watch face for each bezel style is as follows:

Watch face preview image	Corresponds to the default watch face	Note
		/
		/
		/
		/
		/
		Silver strap (Xiaomi Watch S4 Silver Edition)
		Black strap (Xiaomi Watch S4 Black Edition)
		Black rainbow (Xiaomi Watch S4 Black Rainbow Edition)

The Xiaomi Watch S3 Outbox bezel, when installed on the Xiaomi Watch S4, will trigger the corresponding watch face of the Xiaomi Watch S3.
The correspondence is as follows:

Watch face preview image	Corresponds to the default watch face

Note:
Some images shown on the page represent the effect of the Xiaomi Watch S4 strap and bezel set. The strap and bezel set is a retail accessory and must be purchased separately. It is not included in the packaging. The bezel set consists of a stainless steel base and surface stickers. The stickers in different sets are made of either ceramic material or forged copper wire carbon material.
 

12. Q: What are the functionality and support systems of the Xiaomi Watch S4?

A: As shown in the table below:

Function Category	Supported Systems
Walkie-talkie	Supported on Android, not supported on iOS.
Third-party APPs	Not supported.
Gesture control (Fist, Snap)	Only supported on HyperOS 2 system phones, not supported on iOS.
AI smart running routes	Supported on both Android & iOS. The Mi Fitness APP must be updated to 3.29.0 in iOS and 3.35.0 on Android.
Smart running plan
Widgets
Skiing fall detection
Sleep Do Not Disturb
Market watch faces
Training feedback
Visual OS 2.0 optimization

System settings

1. Q: Which phones are compatible with the Xiaomi Watch S4, and how to pair the watch?

A: The Xiaomi Watch S4 must be paired with the Mi Fitness APP before use. The APP is available for both iOS and Android under the same name and can be downloaded from the application store. After pairing, ensure the APP is locked in the background to prevent the system from closing it, which can cause disconnection from the phone and affect normal usage of the watch.
The pairing steps are as follows:
1. Press and hold the power button for about 3 seconds to turn on the watch. Use your phone to scan the QR code displayed on the watch screen, or search for and download the Mi Fitness APP from the application store;
2. Open the Mi Fitness APP, log in to your Xiaomi Account, and enable the necessary permissions requested by the APP;
3. The watch supports three methods of adding a device:
(1). Scan the QR code on the watch screen;
(2). Tap [Add device] and the APP will automatically search for available devices. Select your watch’s Bluetooth name (Xiaomi Watch S4XXXX) from the list of discovered devices. If your watch is not found, try searching again;
(3). Tap [Add device] and select [Add model] at the bottom of the page. Choose [Xiaomi Watch S4] and the APP will automatically search for compatible devices. Select your watch’s Bluetooth name (Xiaomi Watch S4XXXX) from the list. If your watch does not appear, try searching again. If you are using an older version of the APP, update to the latest version and try again;
4. Android phone: When the security code on your phone matches the one shown on the watch screen, agree to the pairing request on both the phone and the watch to complete the pairing;
5. iOS phone: First, go to the Bluetooth settings on your phone and select the Bluetooth name of your watch. Agree to the pairing request on both the phone and watch screens. Then, return to the Mi Fitness APP, select your watch's Bluetooth name, and perform the pairing operation again to complete the connection.
Note:
1. Ensure Bluetooth is enabled on your phone during the pairing process for proper connectivity;
2. If the security code appears on the watch but not on your phone, check the notification bar on your phone for the pairing request;
3. If you cannot find the watch during the device addition process or if the watch cannot connect during use, try pressing and holding the power button on the watch for 3 seconds, selecting [Factory reset] from the system menu, and then try pairing again.
 

2. Q: How to rebind the Xiaomi Watch S4?

A: To bind with a different Xiaomi Account: Perform a factory reset on the Xiaomi Watch S4, then use a new phone to rebind the watch.
To bind with the same Xiaomi Account on a new phone, while the watch is still connected to the original phone, go to the [Settings] on the watch, select [System] and then tap [Connect new phone] to rebind the watch with the new phone.

3. Q: Why does the Xiaomi Watch S4 experience failure to bind and connect to the Bluetooth? 

A: If the watch fails to connect, please refer to the following details:
1. Please check the network connection status of the phone;
2. Please check whether the Bluetooth connection is abnormal. You can try disabling the Bluetooth on the phone and enable it again and continue the pairing.
After the successful Bluetooth connection, if you do not tap the pair icon or the cancel icon, the pairing between the watch and the phone will fail.
If the above details are useless, please try the following methods:
1. Please restore the watch to factory settings;
2. Delete the Bluetooth information of the watch in the Bluetooth list on the phone;
3. Disable the Bluetooth on the phone and enable it again;
4. Go to the Mi Fitness APP and rebind the watch.
If the device is idle for a while and the phone's Bluetooth is enabled and disabled, it will not be able to reconnect successfully and needs to be restarted. Please check for available firmware updates in the Mi Fitness APP and update the watch to the latest firmware version to resume normal use.
 

4. Q: How to keep the Xiaomi Watch S4 connected to the Mi Fitness APP? 

A: Please keep the Mi Fitness APP in the APP whitelist in the APP settings on your phone and keep the Mi Fitness APP running in the background without disabling the Bluetooth. Keep the watch and the phone connected in the available distance.
The setting methods are different for different phones. Please go to the [Mi Fitness] APP >> [Device] >> allow this APP to run in the background and follow the respective instruction to finish the settings.
 

5. Q: How far will the distance between the Xiaomi Watch S4 and the phone make the Bluetooth disconnect automatically? 

A: The Bluetooth connection status between the Xiaomi Watch S4 and the phone will be affected by the surrounding environment.
Here are more details about this issue:
1. In an environment with obstructions, when the watch and the phone are 5-8 meters apart, the Bluetooth will automatically disconnect;
2. In an open area or a corridor, when the watch and the phone are 20 meters apart, the Bluetooth will automatically disconnect;
3. If there is one person between the watch and the phone (the watch faces the front of the phone), when the watch and the phone are 3-5 meters apart, the Bluetooth will automatically disconnect.
The specific performance is subject to actual use.
 

6. Q: How to power on, power off and reboot the Xiaomi Watch S4? 

A: There are two physical buttons at the right of the Xiaomi Watch S4. The upper one is Home button, and the lower one is power button.
To power on, power off and reboot the watch, please refer to the following details:
1. Power on: When the watch is powered off, press and hold the power button for 3 seconds to enter the homepage of the watch;
2. Power off: (1). Press and hold the power button to enter the page of Reboot, Power off, Connect new phone, and Factory reset, and tap [Power off] to power off the watch;
(2). When the watch is powered on, go to [Settings] >> [System] >> [Power off].
3. Reboot: (1). Press and hold the power button to enter the page of Reboot, Power off, Connect new phone, and Factory reset, and tap [Reboot] to reboot the watch;
(2). When the watch is powered on, press and hold the power button for about 12 seconds to force reboot the watch;
(3). When the watch is powered on, go to [Settings] >> [System] >> [Reboot].
 

7. Q: How to enter the dashboard and what are the icons on the Xiaomi Watch S4? 

8. Q: What are the system settings on the Xiaomi Watch S4? 

A: You can tap the settings icon in the dashboard or APP list.
The system settings are listed below:

 

9. Q: How to edit the widgets on the Xiaomi Watch S4? 

A: The Xiaomi Watch S4 supports editing the widgets. You can swipe up to check different widgets on the homepage of the watch, which is not supported editing on the APP.
To configure the widgets on the watch, please refer to the following details:
1. Swipe up to check different widgets on the homepage of the watch. Press and hold the widget to enter the editing page and you can edit the widget order and add widget;
2. You can go to [Settings] >> [Home screen] >> [Widgets] to edit the widget order and add widget;
3. Press the upper button or lower button to exit the widget.
 

10. Q: Does the Xiaomi Watch S4 support customizing the functions of upper and lower buttons? 

A: Not support.
 

11. Q: How to configure locking the Xiaomi Watch S4? 

A: To configure locking the Xiaomi Watch S4, please refer to the following details:
1. By default, if there is no operation within 5 seconds, the screen will automatically be locked. You can modify the time of locking screen in settings, which can be configured in the range from 5 seconds to 5 minutes;
2. The watch supports the function of covering to sleep. After enabling it, cover and touch the watch with your palm and when the covering area exceeds half of the watch, the watch will directly change from screen on to screen off. Please go to [Settings] >> [Display] >> [Cover to sleep] on the watch;
3. Turn the wrist around to make the screen off. After enabling the function of turning the wrist around to make the screen off, the screen will be off if you turn your wrist inversely.
 

12. Q: How to configure raising to wake on the Xiaomi Watch S4? 

A: Please go to [Settings] >> [Display] >> [Raise to wake] >> [Off], [All day] or [Scheduled]. When you select [Scheduled], you need to configure the start time and end time of raising to wake according to your needs.
Swipe up on the homepage of the watch to enter the dashboard and tap the icon of raising to wake to quickly enable or disable the function of raising to wake.
Note:
When the watch is in sleep mode, the function of raising to wake will be disabled automatically. You can configure the sleep time in the Mi Fitness APP.
 

13. Q: How to adjust the brightness of the Xiaomi Watch S4? 

A: The Xiaomi Watch S4 supports automatically and manually adjusting the brightness.
You can go to [Settings] >> [Display] >> [Brightness] >> [Auto] on the watch, and the brightness will be adjusted automatically according to the ambient light.
You can go to [Settings] >> [Display] >> [Brightness] >> disable [Auto] >> [Custom] >> adjust the brightness manually on the watch.
Note:
You need to disable [Auto] before adjusting the brightness manually.
 

14. Q: Does the Xiaomi Watch S4 support configuring passwords? 

A: Support. After enabling this function, when the watch detects that it is not being worn, it will activate the password lock screen to ensure information security. The password is a 6-digit combination of 0-9.
You can go to [Settings] >> [PIN] >> [Set PIN] >> enter the PIN that you want to configure on the watch.
You can also go to the [Mi Fitness] APP >> [Device] >> [Security] >> [Set password] >> follow the instructions to set the password.
 

15. Q: What to do if the password of the Xiaomi Watch S4 is forgotten? 

A: If the password of the Xiaomi Watch S4 is forgotten, please refer to the following details:
1. The password cannot be deleted on the watch, which needs to be made on the APP;
2. Keep the watch and the Mi Fitness APP connected;
3. Please select to disable or change the password on the security page on the Mi Fitness APP.
 

16. Q: Does the Xiaomi Watch S4 support unlocking the phone with Bluetooth? 

A: The watch supports unlocking the phone. This function currently supports Xiaomi phones with system versions of MIUI 12 and above.
When the phone and watch are connected via Bluetooth, the watch unlocking is a one-to-one binding between the watch and the phone. Within a safe distance, the watch can be used as an identity ID to replace the input of the unlock password or pattern, which greatly improves the convenience of operation while ensuring security.
To configure unlocking the phone with the watch, please refer to the following details:
1. Go to the [Mi Fitness] APP >> [Device] >> [Security] >> [Unlock phone] >> set the password and confirm on the watch;
2. After the lock screen password is set, confirm the unlock on the watch to successfully bind. You can choose the unlock distance (close, moderate, slightly far). If you want to unbind the watch, you need to disable the Bluetooth device unlocking function in the phone system settings. Take the Xiaomi phone as an example: [Settings] >> [Fingerprints, face data, and screen lock] >> [Unlock with Bluetooth device].
Note:
The function of unlocking the phone needs to be used with Xiaomi phones running MIUI 12 or above, so if the model and system do not match, the APP will not display the [Unlock phone].
 

17. Q: How does the Xiaomi Watch S4 connect to the network? 

A: The Xiaomi Watch S4 supports using the network shared by the phone via Bluetooth to satisfy your network needs.
Network usage via Bluetooth: When the connection between the watch and the phone is in normal conditions, the network will be synchronized between the watch and the phone.
Note:
The Bluetooth network only supports connecting to Android phones. To use the Bluetooth network, you need to ensure that the watch Bluetooth is connected to the phone normally, and the phone's network connection is normal.
 

18. Q: Does the Xiaomi Watch S4 support connecting to earphones and how to connect? 

A: Support.
Connection method: Please go to [Settings] >> [Network & Connectivity] >> [Bluetooth]. After enabling Bluetooth, wait for the Bluetooth earphones search to complete, tap the earphones you want to connect in the Bluetooth earphones list and wait for the earphones to be connected successfully. If you need to connect the paired Bluetooth earphones, tap the name of the earphones you want to connect on the list page, go to the details page, tap the reconnect icon, and wait for the earphones to be connected successfully.
Earphones management: The paired earphones will be displayed in the earphone list. Tap the earphones you want to manage and you can disconnect, reconnect, or unpair the earphones on the details page.
Usage scenarios: Except for calls and voice assistants, all watch audio can be played through Bluetooth earphones.
Note:
1. The watch will restart when connected to some Bluetooth earphones. This is a compatibility issue caused by non-standard Bluetooth earphone protocols. This bug has been fixed in the latest firmware version of the watch. Please check for available updates on the Mi Fitness APP, update the watch to the latest firmware version, and try again;
2. When you connect Bluetooth earphones and hear no sound while playing music, this is because of the built-in volume adjustment function on the earphones. The watch does not support the volume synchronization function for the earphones. You need to set the volume on the earphones.
 

19. Q: Does the Xiaomi Watch S4 support calling through Bluetooth earphones? 

A: Bluetooth calls are not supported, but ESIM calls are supported. Using the watch to make Bluetooth calls only supports using the watch speaker.
 

20. Q: How to adjust the sound volume on the Xiaomi Watch S4? 

A: The Xiaomi Watch S4 supports adjusting the alarm volume, ringtone volume, media volume and call volume.
To adjust the sound volume on the Xiaomi Watch S4, please refer to the following details:
1. Alarm volume adjustment: (1). Please go to [Settings] >> [Sound and vibration] >> adjust the alarm volume. You can tap the volume plus or minus icons or rotate the rotating crown to adjust the alarm volume;
(2). The alarm volume can be adjusted between 0-10. Both alarm reminders and countdown reminders belong to alarm volume.
2. Ringtone volume adjustment: (1). Please go to [Settings] >> [Sound and vibration] >> adjust the ringtone volume. You can tap the volume plus or minus icons or rotate the rotating crown to adjust the ringtone volume;
(2). The ringtone volume can be adjusted between 0-10. Incoming calls, notifications, system reminders and workout and health reminders belong to ringtone volume;
(3). When the watch is in silent mode, the ringtone volume will be automatically adjusted to 0.
3. Media volume adjustment: (1). Please go to [Settings] >> [Sound and vibration] >> adjust the media volume. You can tap the volume plus or minus icons or rotate the rotating crown to adjust the media volume;
(2). The media volume can be adjusted between 0-10. Music playing on the watch belongs to media volume;
(3). Third-party music APPs support volume adjustment within the APP. The volume adjustment method is subject to the design of the APP.
4. Workout volume adjustment: (1). Please go to [Settings] >> [Sound and vibration] >> adjust the workout volume. You can tap the volume plus or minus icons or rotate the rotating crown to adjust the workout volume;
(2). The workout volume can be adjusted between 0-10. Voice reminders in the workout on the watch belong to workout volume;
(3). The volume of voice reminders in the workout can also be adjusted during a workout. To adjust, swipe right to enter the workout interface, tap the volume control, drag the volume bar on the screen, tap the volume plus or minus icons on the screen, or press the upper and lower buttons to adjust the required volume.
5. Call volume adjustment: (1). The call volume can only be adjusted during a call. Tap the volume button on the in-call page to enter the volume adjustment page. You can drag the volume bar on the screen, tap the volume plus and minus icons on the screen, rotate the rotating crown, or press the upper and lower buttons to adjust the volume;
(2). The call volume can be adjusted between 0-15.
Note:
The volume of voice assistant is fixed and cannot be adjusted (Some mobile phone models support adjusting the voice reminders on the phone).
 

21. Q: How to enable the silent mode on the Xiaomi Watch S4 and what sounds will be turned off after enabling? 

A: To enable silent mode on the Xiaomi Watch S4, please refer to the following details:
1. Go to [Settings] >> [Sound and vibration] >> [Silent];
2. Swipe up on the watch face page to enter the dashboard and tap the silent mode icon;
3. Go to [Settings] >> [Sound and vibration] >> adjust the ringtone volume to 0 manually.
When the silent mode is enabled, all of the notifications or reminders like incoming calls, APP notifications, system reminders and workout and health reminders will only be pushed in vibration.
 

22. Q: Does the Xiaomi Watch S4 support customizing ringtones? 

A: Not support. All of the ringtones on the Xiaomi Watch S4 are defaulted.
 

23. Q: What is the drainage function on the Xiaomi Watch S4? 

A: The drainage function can be used when the speaker of the watch is flooded after swimming or in daily life. The principle of the drainage function is to play a sound of a specific frequency to make the speaker vibrate and use the vibration to drain the water that has invaded the speaker, thus protecting the speaker from being corroded by water.
You can press the lower button on the homepage of the watch to enter the dashboard and tap the drainage icon.
After swimming, the watch will enable the drainage function automatically.
 

24. Q: How to use the quick gestures on the Xiaomi Watch S4? 

A: The supported gestures on the Xiaomi Watch S4 are listed below:
1. Flip your wrist outward and inward: Keep your forearm parallel to your chest, palm down, screen up, quickly flip outward 90 degrees, and then quickly reverse inward;
2. Quickly shake your wrist: Keep your forearm parallel to your chest, palm down, screen up, and quickly shake outward twice horizontally;
3. Snap your fingers (rub your fingers): Keep your forearm parallel to your chest, palm down, screen up, and try to snap your fingers when the screen is on, or rub your thumb with your middle finger or index finger;
4. Make a fist: It is not supported customizing. You need to configure it on the PC/PAD device controlling page in the Xiaomi Smart Hub. Place your forearm parallel to your chest, with your palm facing down and the screen facing up, and clench and release your hands to turn the page on the other device to the next page. Only when the device controlling page displays the information that gesture control is enabling can it be used.
Note:
When using the snap gesture, you need to remain still, with your forearm parallel to your chest, and the watch screen will light up and stay on the watch face page.
You can go to [Settings] >> [Quick gestures] >> enable quick gestures. When you enable it, you can configure the application scenarios of the respective gesture, such as dismissing incoming calls, shooting with gesture, smart linkage with the Mi Home/Xiaomi Home APP, enabling voice assistant and weather APP or configuring no scenario.
Note:
1. To use quick gestures, you need to ensure that the function of raising to wake is enabled normally. Enabling it will reduce the battery life of the device;
2. The gesture does not respond to gestures in sleep mode/Do Not Disturb mode/battery saver mode, AOD dial page, or when sleep is detected. For specific usage scenarios, please refer to the watch gesture description page;
3. The gesture-opening application function only supports responses when the watch is on. The AOD page cannot respond. If you wake the screen aslant, it will not be successfully triggered;
4. To use the function of turning the device page with the gesture, you need to connect to a mobile phone that supports Xiaomi HyperOS 2, and the controlled device must support related functions;
5. To use the function of smart linkage on the Mi Home/Xiaomi Home APP with the gesture, you need to connect to a mobile phone equipped with Xiaomi HyperOS 2 or a Bluetooth Mesh gateway that supports related functions, and update the Mi Fitness APP to the latest version, and the Mi Home/Xiaomi Home to version 10.0 and above.
 

25. Q: How can the quick gestures of the Xiaomi Watch S4 be used to control the other devices?

A: Use the quick gestures to control the devices connected to Xiaomi Home/Mi Home APP:
Use the Mi Fitness APP to bind the watch and phone. Ensure both are logged into the same Xiaomi account used in the Xiaomi Home/Mi Home APP.
Open the Xiaomi Home/Mi Home APP >> [Profile] >> [Additional settings] >> data access management for people, cars and homes, enable the permission of the Mi Fitness APP, and configure gesture automation scenarios.
Go to [Settings] on the watch >> [Quick gestures] >> enable [Gestures], and select Xiaomi Home/Mi Home linkage.
The watch needs to be connected to a Xiaomi phone that supports the corresponding features, and the phone should be connected to the network or always within the range of a Bluetooth Mesh gateway device that supports the relevant function.
Fist gesture to turn the page:
Supported devices: Xiaomi Pad (the controlled device needs to support the relevant feature).
The watch and phone should be bound via the Mi Fitness APP. The phone needs to support the relevant feature and be logged into the same Xiaomi account on both the watch and the controlled Xiaomi Pad. Additionally, all devices should be on the same local network (the related devices can be found in the Xiaomi Smart Hub connected to the watch).
In the Xiaomi Smart Hub on the watch, find the device you want to control, such as a tablet. Tap the device icon to enter the device page, and swipe up the page to open the Gesture control switch. Stay on the page where the page-turning button is displayed. When the screen shows that Gesture control is on, you can turn the page by making a fist gesture.
Note:
1. To use gesture control for other devices, you need a device with Xiaomi HyperOS 2 or above. The controlled device needs to meet the necessary requirements. For detailed setup, please refer to the Xiaomi HyperOS official website;
2. For the automation scene function in the Xiaomi Home/Mi Home APP, the watch needs to be connected to a phone running Xiaomi HyperOS 2 or paired with a compatible Bluetooth Mesh gateway. Additionally, ensure the Mi Fitness APP is updated to the latest version, and the Xiaomi Home/Mi Home APP is updated to version 10.0 or above.
 

26. Q: What are the ways to turn on the screen of the Xiaomi Watch S4?

A: 1. In the screen-off state, press the power button or the function button;
2. If the Raise to Wake feature is enabled, raise your wrist to light up the screen;
3. If the Double-tap to wake feature is enabled, double-tap the screen in the screen-off or Always-on display (AOD) state to light up the screen.
 

27. Q: Does the Xiaomi Watch S4 support Always-on display (low light mode/AOD)?

A: It supports Always-on display. When enabled, the watch enters AOD mode after the screen turns off. In this mode, you can wake the screen by raising your wrist or pressing a button, exiting AOD.
The setting method is as follows:
Go to [Settings] on the watch >> [Display] >> [Always-on display] >> you can turn on [Smart] or [Scheduled]. The default period for scheduled is 08:00-22:00.
Note: 
When Always-on display (AOD) is enabled, the screen will turn off if the watch is removed for 5 minutes or when sleep is detected at night. Enabling this feature will reduce the watch's battery endurance.
 

28. Q: Can the Xiaomi Watch S4 control the phone to play music?

A: The watch can control the phone to play music. To use this function, the phone and the watch need to be connected. Ensure [App notifications] are turned on in Mi Fitness APP, and the permission to use message notifications is turned on.
Open the music player on the mobile phone and start playing music. Enter the function list on the watch. Select the music application to enter the music control page. You can play/pause music, switch to the previous/next track, and increase/reduce the volume.
Note:
It supports most music players on the market, but due to differences in the openness of music players and APP versions, the experience of the watch’s music control function can be affected to a certain extent.
 

29. Q: Does the Xiaomi Watch S4 support local music playback on the watch?

A: Support. You can switch audio sources, choose the watch to play music locally or control mobile phone music. When the watch is connected to an Android phone, mobile phone music can be downloaded to the watch for playback, and playlists can also be added.
Go to the Mi Fitness APP >> [Device] >> [Apps] >> [Music] >> [Manage music]. Tap the [Add Music] button at the upper right corner of the music settings interface to download mobile music to the watch. Tap the [Add Playlist] button to add a playlist.
Note:
Downloading songs is not supported when connected to an iOS phone, but if there are songs in the watch, they can be played.
 

30. Q: Why does the Xiaomi Watch S4 show insufficient storage when downloading/transferring songs?

A: The system storage is limited. To ensure the download space for other modules such as watch faces and third-party applications and the stability of the system, a module storage limit is set. A pop-up will be prompted when one of the following conditions is triggered (whichever is reached first)
1. The number of songs exceeds 60 (a maximum of 60 songs can be downloaded);
2. The total size of audio files exceeds 2GB (including recording files, music files, etc.).
 

31. Q: What to do if the network speed for downloading music on the Xiaomi Watch S4 is slow?

A: Switch your phone to a 4G/5G data network or connect to a different Wi-Fi network, then try again.
 

32. Q: How to set the time on the Xiaomi Watch S4?

A: After the watch and mobile phone are paired via Bluetooth and synchronized data, the watch will automatically synchronize the time of the mobile phone system without manual settings. If the time of the mobile phone is modified, it will be modified synchronously after the watch is connected to the mobile phone.
 

33. Q: Does the Xiaomi Watch S4 have the same monitoring effect when worn on the left and right hands?

A: The watch can be worn on the left or right hand. It does not affect the normal sampling of sports and health data. The data monitoring effect is consistent. You can choose to wear it according to your habits.
 

34. Q: How long can the data on Xiaomi Watch S4 be saved independently?

A: Exercise data on the watch will always be saved, and heart rate and pressure data will be retained for 30 days. The sleep data will only be retained for the current day. Please connect to your mobile phone in time and synchronize it to the Mi Fitness APP. If the watch is reset, the previous exercise data on the watch will be cleared, and the data synced to the Mi Fitness APP will not be cleared.
Note:
All exercises need to meet the minimum exercise recording standard (calorie consumption is no less than 3 kcal) before they will be saved, otherwise, they will not be saved.
 

35. Q: Can the vibration intensity of the Xiaomi Watch S4 be adjusted?

A: Yes. Go to [Settings] >> [Sound and Vibration] >> [Vibration Intensity] >> select [Standard] or [Enhanced].
Note:
Turning on enhanced vibration will shorten the watch’s battery endurance.
 

Charging and Battery Endurance

1. Q: What is the battery endurance of the Xiaomi Watch S4?

A: It takes about 60 minutes to fully charge the Xiaomi Watch S4.
Test conditions for battery endurance that meet actual usage scenarios:
1. The typical battery endurance for the Xiaomi Watch S4 is 15 days, based on the following testing conditions:
(1). The watch is fully charged and used with factory default settings, and uses a black rainbow watch face. High-precision sleep monitoring, sleep breathing quality monitoring, all-day stress monitoring, and all-day blood oxygen monitoring are disabled;
(2). 10-minute per session all-day heart rate monitoring is enabled;
(3). App notifications are turned on, receiving 100 messages per day, 2 incoming call reminders, 3 alarm notifications;
(4). The screen is awakened by raising to wrist 200 times per day, 1 data sync per day via APP, 15 minutes of Bluetooth calls per week;
(5). 30 minutes of local music playback through Bluetooth headphones per week (local music playback only supported on Android phones);
(6). 90 minutes of sports tracking per week (GNSS enabled).
With these settings, the battery endurance is expected to be 14.5 days when paired with an iOS phone. Additionally, 5 minutes of charging provides a 2-day battery boost, based on the typical battery model for the Xiaomi Watch S4.
2. The AOD battery endurance for the Xiaomi Watch S4 is 5 days, based on the following testing conditions:
(1). The watch is fully charged and used with factory default settings, and uses a black rainbow watch face. The Smart option of AOD is turned on. High-precision sleep monitoring, sleep breathing quality monitoring, all-day stress monitoring, and all-day blood oxygen monitoring are disabled;
(2). 10-minute per session all-day heart rate monitoring is enabled;
(3). App notifications are turned on, receiving 100 messages per day, 2 incoming call reminders, 3 alarm notifications;
(4). The screen is awakened by raising to wrist 200 times per day, 1 data sync per day via APP, 15 minutes of Bluetooth calls per week;
(5). 30 minutes of local music playback through Bluetooth headphones per week (local music playback only supported on Android phones);
(6). 90 minutes of sports tracking per week (GNSS enabled).
3. The 17-hour battery endurance in continuous intercom mode is based on test data from Xiaomi Lab under the following test conditions:
(1). The watch is fully charged and used with factory default settings, and uses a black rainbow watch face. High-precision sleep monitoring, sleep breathing quality monitoring, all-day stress monitoring, and all-day blood oxygen monitoring are disabled;
(2). 10 minutes per session of all-day heart rate monitoring is enabled;
(4). App notifications are turned on, receiving 100 messages per day, 2 incoming call reminders;
(5). The screen is awakened by raising to wrist 200 times per day, 1 data sync per day via APP, and 15 minutes of Bluetooth calls per week.
 

2. Q: What is the battery capacity of the Xiaomi Watch S4? How to charge?

A: The battery capacity of the Xiaomi Watch S4 is 486mAh. The standard package includes a magnetic USB charging dock, with a charging time of 60 minutes.
The charging method is as follows:
1. Place the watch on the charging dock, ensuring that the charging contacts on the back of the watch align completely with the metal contacts on the dock;
2. Connect the other end of the charging dock to a USB-A charger (with an output voltage of 5V and output current ≥ 0.5A).
When the watch's battery drops below 20%, 10%, or 5%, a prompt will appear to connect the charger for charging. During the charging process, a charging notification will be displayed;
Note:
1. If the watch cannot power on after being idle for a long time, it will take about 1 minute of pre-charging before the charging icon appears;
2. Before charging, clean the watch's charging contacts to remove any sweat or moisture to ensure proper charging.
 

3. Q: Why does the Xiaomi Watch S4 drain fast and have a short standby time?

A: The power consumption of the watch is related to the daily use of the individual. For example, some special scenarios lead to an increase in the number of times the screen is lit up when the wrist is raised, frequent message reminders, heart rate detection functions that are turned on all day, etc., which will also lead to increased power consumption.
At the same time, the amount of current required for the heart rate detection of the watch will vary due to individual physical differences, resulting in differences in power consumption. You can turn off some unnecessary functions to improve the battery endurance of the watch.
For example, suppose you don't need to use the features (All-day blood oxygen tracking, Continuous monitoring for the heart rate, Stress monitoring and App notification). In that case, it is recommended to turn it off by referring to the steps: Go to Mi Fitness APP >> [Device] >> [Fitness and health]/[Incoming calls and notifications].
1. Continuous monitoring of heart rate, blood oxygen, and stress leads to faster battery drain, with higher detection frequency causing faster power consumption. In Bluetooth mode, under heavy usage conditions with these features enabled, standby time is about 5 days, and a 20% battery drop per day is considered normal;
2. Frequent synchronization of phone notifications can lead to faster battery consumption. It is recommended to turn off unnecessary message sync notifications;
3. Enabling Always-on display (AOD), high-precision sleep tracking, and enhanced vibration can lead to faster battery drain. In Bluetooth mode, under heavy usage conditions with AOD enabled, standby time is about 3-5 days, and a 30% battery drop per day is considered normal;
4. The above scenarios do not include features like motion detection, gesture recognition, sleep rhythm, sleep apnea detection, and atrial fibrillation (AFib) monitoring. When these features are enabled, power consumption will increase because the algorithms and sensors need to remain active. You can enable or disable these features as needed.
Note:
In the Xiaomi Watch S4, the 15-day battery endurance statistic for typical usage does not include the power consumption from the Always-on display (AOD) feature. If AOD is enabled, the battery endurance could be reduced to about half of the original estimated duration.
 

4. Q: Does the Xiaomi Watch S4 support ultra battery saver (ultra-long battery endurance) mode?

A: Yes, the ultra-long battery endurance mode is the ultra battery saver mode of the watch.
To turn on the ultra battery saver mode, please refer to the following methods:
1. Open [Settings] on the watch >> [Battery] >> enable [Ultra battery saver];
2. Swipe to open the control panel on the main watch face of the watch, and tap the [Ultra battery saver] icon;
3. When the watch pops up a 5% low battery reminder, there will be a [Turn on ultra battery saver mode] icon on the reminder page. Tap the icon to turn on ultra battery saver mode.
To exit the ultra battery saver mode, Please refer to the following methods:
1. Press and hold the power button (down button) for 2 seconds to exit the ultra battery saver mode;
2. Put the watch on the charging stand to charge, and it will automatically exit the ultra battery saver mode.
Note:
The watch cannot enter the long battery endurance mode while charging.
 

Health Related

1. Q: Does the Xiaomi Watch S4 support sleep monitoring?

A: The watch supports all-day sleep monitoring, including long sleep periods and short naps. After enabling sleep advanced monitoring, the watch can provide detailed sleep quality distribution. When worn during sleep, the watch automatically detects sleep using built-in sensors.
Ways to view sleep data:
1. Swipe to the widget interface from the main watch face and check the sleep widget for last night’s sleep duration. Tap to view more details;
2. Tap the Sleep icon to view daily sleep data;
3. Sync the watch data with the Mi Fitness APP, then tap [Sleep] in the Health section to check historical records, including daily, weekly, and monthly views. You can also check sleep stages like deep sleep, light sleep, REM, and awake periods, along with detailed timeline data.
Note:
1. There is a delay in generating sleep reports. If you open the sleep function immediately after waking up, the sleep report can be unavailable;
2. The watch stores detailed sleep data from the previous night and sleep stage data for the past seven days. Sync with the Mi Fitness APP regularly to avoid data loss.
 

2. Q: Will the heart rate display when the Xiaomi Watch S4 is not worn?

A: If the watch is not worn, the heart rate application will not display real-time heart rate. After enabling all-day heart rate monitoring, you can view the historical and resting heart rate.
Note:
1. Watch faces showing heart rate data will display "0" when not worn;
2. In some cases, due to the heart rate detection mechanism, the watch will display heart rate when placed on dark surfaces.
 

3. Q: Why is the Xiaomi Watch S4 heart rate data inaccurate or fluctuating?

A: Inaccurate or fluctuating heart rate data can result from loose wearing, skin tone, body hair, reduced blood perfusion, low temperatures causing blood vessel constriction, or dirt/moisture between the watch and wrist.
To ensure accuracy, please wear the watch snugly, as wearing the watch too loosely will result in inaccurate measurement data during exercise. Ensure it doesn’t slide during movement. Position it one finger-width above the wrist bone. 
In cold weather conditions, low temperatures can cause capillaries in the extremities to constrict, redirecting blood flow to the torso and vital organs. This makes it harder for the wrist's photoplethysmography (PPG) sensor to obtain accurate heart rate signals and increases the likelihood of losing true heart rate data during exercise. Therefore, it is recommended to warm up thoroughly before exercising to increase blood flow, making it easier for the sensor to capture accurate heart rate data.
Ensure that the back cover of the watch is clean and dry, the watch body is at a moderate temperature (neither too high nor too low), the wrist is free of sweat or debris, and the watch is worn comfortably and snugly.
At the same time, engineers are working hard to optimize the solution. Please wait for future updates.
Note:
The heart rate data is sourced from Xiaomi's laboratory test. The accuracy of heart rate measurements refers to the percentage of cases where the device's output has an error of less than 10 bpm compared to the standard. In actual use, accuracy will vary due to individual differences, usage habits, and environmental factors.
 

4. Q: What to do if heart rate measurement fails on the Xiaomi Watch S4?

A: Check if the protective film on the back of the watch has been removed. If the protective film is removed, disable all-day heart rate monitoring, then open the heart rate APP for a single measurement. While measuring, check if the heart rate light at the watch’s bottom is on. If the light doesn’t turn on, try unbinding and re-pairing the watch or restarting it. If issues persist, please apply for the after-sales service.

Note:
The back cover of the watch comes with a protective film from the factory to prevent damage during transportation. The measurement of blood oxygen and heart rate relies on sensors located on the back cover. The protective film must be removed for these functions to work properly. If the film is not removed, the sensor light cannot reach the wrist skin, resulting in failed measurements or no readings.
 

5. Q: What to do if the blood oxygen data on the Xiaomi Watch S4 is inaccurate?

A: Inaccuracy can be caused by wearing style, skin tone, body hair, reduced blood perfusion, or dirt/moisture on the watch.
Please follow the measurement instructions to measure again:
1. Please wear one finger-width above the wrist bone;
2. Wear snugly and stay still during the measurement.
At the same time, engineers are working hard to optimize the solution. Please wait for future updates.
Note:
Factors such as wearing conditions, skin characteristics, and the environment will affect the accuracy of measurements or even cause measurement failures. This product is not a medical device. The results are for reference only, and not intended for diagnosis or treatment purposes.
 

6. Q: What to do if the blood oxygen measurement fails on the Xiaomi Watch S4?

A: Check if the protective film has been removed. If the protective film is removed, measure again according to the failure prompt instructions.
Disable all-day blood oxygen monitoring, tap the SpO₂ APP on the watch, and then try a single measurement. Ensure the blood oxygen light at the bottom is on during the process. If the light doesn’t turn on, restart or re-pair the watch. If issues persist, please apply for the after-sales service.

Note:
The back cover of the watch comes with a protective film from the factory to prevent damage during transportation. The measurement of blood oxygen and heart rate relies on sensors located on the back cover. The protective film must be removed for these functions to work properly. If the film is not removed, the sensor light cannot reach the wrist skin, resulting in failed measurements or no readings.
 

7. Q: Why are there multiple low blood oxygen data when wearing the Xiaomi Watch S4 while sleeping?

A: 1. Low blood oxygen data (below 90%) during sleep can occur due to conditions like snoring;
2. Ensure the watch fits snugly on the wrist;
3. Update the watch to the latest firmware using the Mi Fitness APP for optimized blood oxygen monitoring.
 

8. Q: What to do if the SpO₂ APP crashes or locks the screen when blood oxygen is measured on the Xiaomi Watch S4?

A: This issue has been resolved in the latest firmware update. Please tap [More] >> [Update] at the bottom of the Device interface in the Mi Fitness APP, update the watch to the latest version, and retry.
 

9. Q: How does the Xiaomi Watch S4 alert for high or low heart rates?

A: In a calm state, the watch monitors the heart rate for 10 minutes. (Once the calm state is broken, abnormal monitoring will stop.) If the average rate exceeds or falls below the set threshold, an alert appears.

Note:
During exercise and within 20 minutes after exercise, heart rate (non-active) high or low alerts, as well as abnormal heartbeat alerts, will not be triggered.
 

10. Q: How to enable sleep rhythm screening on the Xiaomi Watch S4?

A: Open the Mi Fitness APP >> [Health] >> [Sleep] >> [Sleep rhythm screening program] >> select monitoring cycle (14 or 28 days) >> enable [Sleep rhythm monitoring] >> follow the sleep settings prompts.
Note:
1. Wear the watch during sleep throughout the chosen cycle, then it will generate sleep rhythm monitoring data;
2. Record relevant information of the diary in the chosen cycle. After the cycle ends, a sleep rhythm monitoring report (including sleep rhythm data and diary) will be generated. You can take the report to a hospital for further treatment or seek additional diagnosis at a third-party hospital partnered with the Mi Fitness APP.
The sleep rhythm monitoring report is illustrated as follows:

 

11. Q: Why isn’t the Cycles APP displayed in the APP list of the Xiaomi Watch S4?

A: 1. By default, the Cycles APP is visible;
2. If there’s no historical data of the Cycles, the APP will be hidden. It becomes visible once data is added in the Mi Fitness APP;
3. If you have set whether the APP should be displayed in the list, it will follow your settings.
 

Workout Related

1. Q: What workout modes does the Xiaomi Watch S4 support?

A: The workout modes are as follows: 
The Xiaomi Watch S4 supports 17 workout modes, which provide professional sports data other than heart rate and calories, including Outdoor running, Walking, Treadmill, Outdoor cycling, Hiking, Trail run, Trekking, Triathlon, Pool swimming, Open water swimming, Elliptical, Rower, Jump rope, HIIT, Snowboarding, Skiing, and Cross-country skiing. Additionally, 144 extended sports can record your heart rate, calorie consumption, exercise duration, and performance data.
Complete list of workout modes:
Pool swimming, Open water swimming, Sailing, Paddleboarding, Water polo, Water sports, Water skiing, Kayaking, Rafting, Rowing, Powerboating, Finswimming, Diving, Artistic swimming, Snorkeling, Kitesurfing, Flowriding, Dragon boat, Outdoor running, Walking, Hiking, Outdoor cycling, Trail run, Trekking, Triathlon, Skateboarding, Roller skating, Parkour, ATV, Paragliding, BMX, Race walk, Rock climbing, Freestyle, Treadmill, Jump rope, HIIT, Yoga, Indoor cycling, Elliptical, Rower, Stair climber, Stepper, Spinning, Core training, Flexibility, Pilates, Gymnastics, Stretching, Strength, Cross training, Stair climbing, Aerobics, Physical training, Wall ball, Dumbbell, Barbell training, Weightlifting, Deadlift, Burpee, Sit-ups, Functional training, Upper body, Lower body, Abs, Back, Air walker, Horizontal bar, Parallel bar, Stepper, Mass gymnastics, Cardio combat, Battle rope, Aerobic combo, Indoor walking, Indoor fitness, Square dancing, Belly dance, Ballet, Street dance, Zumba, Folk dance, Jazz dance, Latin dance, Hip hop, Pole dance, Breaking, Ballroom dance, Modern dance, Dance, Boxing, Wrestling, Martial arts, Tai Chi, Muay Thai, Judo, Taekwondo, Karate, Kickboxing, Kendo, Fencing, Jujutsu, Tennis, Basketball, Golf, Soccer, Volleyball, Baseball, Softball, American football, Hockey, Table tennis, Badminton, Cricket, Handball, Bowling, Squash, Billiards, Shuttlecock, Beach soccer, Beach volleyball, Sepak takraw, Futsal, Hacky sack, Bocce, Jai alai, Gateball, Dodgeball, Snowboarding, Cross-country skiing, Ice skating, Indoor ice skating, Curling, Snow sports, Snowmobile, Ice hockey, Bobsleigh, Sledding, Archery, Darts, Horse riding, Tug of war, Hula hoop, Kite flying, Fishing, Frisbee, Shuttlecock, Swinging, Somatosensory game, Table football, Shuffleboard, Esports, Chess, Checkers, Weiqi, Bridge, Board game, Equestrian, Athletics, and Auto racing.
The Auto detect function:
When enabled, the watch will notify you when it detects that you are starting or stopping a workout. Supported workout types include Walking, Running, Cycling, Rower, Elliptical, and Jump rope. Setting path: Go to [Settings] on the watch >> [Auto detect] >> turn on the switch.
 

2. Q: What data does the Xiaomi Watch S4 display for workout modes?

A: It supports 22 workout modes that display the following data:
Outdoor running:

Workout summary		Goal completion (will only display if a goal is set)		Data item display		Heart rate chart		Heart rate zone
Recovery heart rate chart (if recovery heart rate function is enabled)		Pace chart		Cadence chart		Average vertical stride ratio		Average vertical amplitude
Average GCT (Ground Contact Time)	Average elevation		Training effect		Training effect		Operation interface		Workout results

Note: 
The goal completion interface (only displays if a goal is set) and recovery heart rate chart (if recovery heart rate function is enabled) will not be illustrated in subsequent exercise modes, specifically referring to the outdoor running mode for details.
Walking:

Workout summary	Data item display	Heart rate chart	Heart rate zone
Pace chart	Cadence chart	Average elevation	Training effect
Training effect	Operation interface	Workout results

Treadmill:

Workout summary	Data item display	Heart rate chart	Heart rate zone
Pace chart	Pace zone	Cadence chart	Training effect
Training effect	Operation interface	Workout results

Outdoor cycling:

Workout summary	Data item display	Heart rate chart		Heart rate zone
Pace chart	Average elevation	Training effect		Training effect
Operation interface	Workout results

Hiking/Trail run/Trekking:

Workout summary	Data item display	Heart rate chart		Heart rate zone
Pace chart	Average elevation	Training effect		Training effect
Operation interface	Workout results

Elliptical:

Workout summary	Data item display	Heart rate chart	Heart rate zone
Cadence chart	Training effect	Training effect	Workout results

Pool swimming:

Workout summary	Data item display	Data item display	Average pace
Average SPM	Average SWOLF	Training evaluation	Workout results

Open water swimming:

Workout summary	Data item display	Data item display	Average pace
Average SPM	Average SWOLF	Training evaluation	Workout results

Rower:

Workout summary	Data interface	Data item display		Heart rate chart
Heart rate zone	Average SPM	Training effect		Training evaluation
Operation interface	Workout results

Jump rope:

Workout summary		Data interface		Data item display		Heart rate chart
Heart rate zone	Average SPM		Training effect		Training evaluation		Workout results

HIIT:

Workout summary	Data item display	Heart rate chart	Heart rate zone
Training effect	Training effect	Operation interface	Workout results

Triathlon:

Workout summary	Summary interface	Swimming data	Outdoor cycling data
Outdoor running data	Training effect	Operation interface	Workout results

Skateboarding:

Workout summary	Data item display	Heart rate chart	Heart rate zone	Pace chart
Average elevation	Training effect	Training effect	Operation interface	Workout results

Snowboarding:

Workout summary	Data item display (glide information)	Data item display	Heart rate chart
Heart rate zone	Pace chart	Average elevation	Training effect
Training effect	Operation interface	Workout results

Other extended workouts (145 types):
Workout summary, goal completion (requires setting a workout goal to display), data item display (duration, calories), heart rate chart, heart rate zone, training effect.
 

3. Q: How to start/pause/end a workout on the Xiaomi Watch S4?

A: Start:
In the APP list, tap the Workout APP to enter the workout list, then select the workout you want to begin and tap [GO] to start.
Pause:
Press the function button (Rotating Crown) or swipe left during the workout to access the control interface, then tap [Pause] to pause the workout. Afterward, you can choose to either end or continue the workout.

End:
After pausing, the following icons will be displayed:
1. Tap the [Pause] or [Resume] icon to resume the workout;
2. Press and hold the [End] icon for 2.5 seconds to end the workout;
3. Tap the [Volume] icon to adjust the voice broadcast volume during the workout.

Note:
1. If the workout intensity is too low (short duration or distance), the workout record will not be saved;
2. Some workout modes have an [Interconnectivity] or [Next set] icon on the control interface.
 

4. Q: Does the Xiaomi Watch S4 support running courses?

A: It supports the following 10 running courses:

Basic Introduction	Basic run/walk	Suitable for beginner runners. Alternating between jogging and fast walking, helps the body adapt to running and other aerobic activities.
	Advanced run/walk	Suitable for beginner runners. Alternating between jogging and fast walking, gradually increases jogging duration to improve physical performance.
	Basic jog	Moderate to low-intensity running training. Suitable for beginner runners, progressively improves personal physical performance.
Fat Loss and Weight Reduction	Fat burn run (Basic)	Suitable for runners aiming for fat loss and weight reduction. Increasing energy expenditure to promote fat loss and weight reduction.
	Fat burn run (Advanced)	A single long-duration moderate to low-intensity training. Continuous jogging for sustained fat loss and weight reduction.
	MIIT fat-burning run	Moderate-intensity interval fat-burning running training. Alternating between jogging and medium-speed running to improve fat-burning efficiency.
Stamina Improvement	Endurance run (Basic)	Suitable for runners wanting to improve running endurance. Improving running endurance levels and enhancing aerobic capacity.
	Endurance run (Advanced)	A single long-duration jogging training. Improving aerobic endurance levels and enhancing long-distance running ability.
Cardiopulmonary Exercise	Interval run (Basic)	Suitable for runners wanting to improve cardiopulmonary ability. Enhancing cardiopulmonary capacity and improving VO2 max levels.
	Interval run (Advanced)	Suitable for runners wanting to improve cardiopulmonary ability. High-intensity stimulation of the cardiopulmonary system to boost VO2 max levels.

Tap the [Running] icon in the watch's application list to enter the running courses APP. In an open outdoor environment, after selecting the desired course, you can tap to start the workout.

Tap [Introduction] at the bottom of the positioning preparation page allows you to view the introduction of the current running course, such as the basic run-walk combination course shown in the image below.

 

5. Q: How to set the exercise reminder on the Xiaomi Watch S4?

A: To set the exercise reminder, please refer to the steps as follows:
1. You can enter the sports list by tapping on the sports application on the watch. Tap a specific sport in the sports list to enter the go interface. You can tap the setting button at the bottom of the go interface to set it;
2. Tap [Reminders] in the settings. You can choose to set reminder items based on Distance, Pace alert, Target HR zone, High HR alert, and Hydration according to your own needs.
Take outdoor running as an example:
Distance reminder: The default is 1km, and the adjustment unit is 1km, you can set it according to your situation;
Pace reminder: The default is 5 minutes and 30 seconds, and the adjustment unit is 10 seconds. You can set it according to your situation;
Target HR zone alert: You can choose the heart rate zone corresponding to light, intensive, aerobic, anaerobic, and VO2 max;
High HR alert: The default is the automatically calculated maximum heart rate. The adjustment unit is 1 beat/min. You can set it according to your situation.
Hydration reminder:
Reminder by distance, the default is 1 km, the adjustment unit is 1 km, and you can set it according to your situation;
Reminder according to the duration, the default is 10 minutes, the adjustment unit is 5 minutes, you can set it according to your situation.
 

6. Q: What do the data of maximum altitude, average altitude, cumulative ascent and descent mean respectively on the Xiaomi Watch S4?

A: 1. The highest altitude is the maximum value of the altitude value per unit time during the exercise;
2. The average altitude is the average value obtained by accumulating and dividing the altitude values of each unit of time during the movement;
3. The cumulative rise/fall is the accumulation of the cumulative upward/downward data during the exercise. Take the cumulative rise as an example. For example, when riding, there are 5 uphills on flat ground. After climbing each slope, the altitude will increase by 8 meters. Then The cumulative rise after climbing these 5 slopes is 5 x 8 = 40m (the same is true for the cumulative decline, and the cumulative height difference of the slopes is summed).
 

7. Q: How to set goals during exercise on the Xiaomi Watch S4?

A: When selecting sports mode on the watch, you can set sports goals: You can choose sports with distance, duration, and calorie consumption as goals according to your own needs, and you can set the target values for these sports based on the above three goals. Slide down to clear the target.
Take outdoor running as an example:


1. Duration: The default is 30 minutes, with an adjustment unit of 5 minutes. You can set it according to your own needs;
2. Distance: The default is 3 kilometers, with an adjustment unit of 1 kilometer. You can set it according to your own needs;
3. Calories: The default is 300kcal, with an adjustment unit of 50kcal. You can set it according to your own needs;
4. Sliding Duration (Skiing support): The default is 30 minutes, and you can adjust it based on your needs;
5. Lengths (Swimming support): The default is 8 laps, and you can adjust it based on your needs;
6. Times (Rowing machine support): The default is 200 reps, and you can adjust it based on your needs;
7. Jumps (Jump rope support): The default is 1000 jumps, and you can adjust it based on your needs.
When selecting skiing as the activity, there will be safety settings: Depending on whether you choose to enable skiing fall detection, there will be an emergency call option. If a fall is detected, the skiing emergency call will default to calling the emergency contact, and when enabled, it allows you to choose between calling the emergency contact or the nearby ski resort.
Each sport supports experience: When the training experience switch is turned on, a training experience page will pop up at the end of the workout. After selecting your experience, it can be viewed in the workout report.

 

8. Q: How to check exercise records on the Xiaomi Watch S4?

A: After the exercise is completed, the watch will generate a rich and vivid exercise report. All exercise record data include exercise date, time, distance, calories, number of steps, pace, speed, heart rate, pace curve, speed curve, heart rate curve, heart rate ratio, cadence curve, and stride length, etc.
The viewing method is as follows:
1. View detailed exercise data in the [Activity] application of the watch;
2. After the watch is connected to your phone, tap [Data] on the Mi Fitness APP homepage. On today's activities page, tap the [Calendar] icon in the upper left corner to view the exercise records of any day. In addition to the exercise information on the watch, you can also view Movement trajectories and other information.
 

9. Q: How to add sports activities to the sports list on the Xiaomi Watch S4? How many sports activities can be added?

A: The sports list does not support adding sports activities, but you can start additional sports activities by selecting [More] at the bottom of the list.
 

10. Q: Does the Xiaomi Watch S4 support hiding sports items in the sports list?

A: Not supported.
 

11. Q: How to adjust the order of the Xiaomi Watch S4 sport list?

A: The order of the sports list cannot be edited on the watch. The order will be automatically adjusted based on the number of times the sports items are used.
 

12. Q: Does the Xiaomi Watch S4 support voice broadcast during exercise? How to turn off exercise broadcast on the Xiaomi Watch S4?

A: It supports voice broadcast. If you need to turn it off, you can turn off the corresponding exercise reminder in the exercise settings before starting the exercise or directly pull the volume to the bottom in the volume settings.

 

13. Q: How to check the day’s steps, activity calories, and effective standing/medium-to-high-intensity activities on the Xiaomi Watch S4?

A: There are three methods to check:
1. Component card: Swipe left or right on the watch's homepage to view current calories, steps, effective standing data/medium-to-high-intensity activities on the corresponding widget;
2. Application list: Tap the power button of the watch to enter the application list, and tap the [Activity] application icon to view it;
3. Mi Fitness APP: With the phone connected to the watch, open the Mi Fitness APP and tap the vitality indicator card on the health tab page to view it.
Note:
Only one of the two "effective standing" and "moderate-to-high-intensity activities" in the vitality indicator can be displayed. You can go to the Mi Fitness APP >> [Health] >> [Vitality score] >> tap the [More] icon at the upper right corner >> [Goal management] >> [Switchable goals], and select effective standing or medium-to-high-intensity activities as the [Vitality score]. There are three data items.
 

14. Q: How to set the standing reminder on the Xiaomi Watch S4?

A: Turn on [Reminder to stand up] in the Mi Fitness APP. If there is no walking or strenuous hand activity within an hour, a standing reminder will be sent, but the following conditions need to be considered:
1. If there is any behavior of walking around or wearing the watch for exercise within one hour, the reminder will be extended for half an hour, and the delay time shall not exceed one hour;
2. If the violent hand activity reaches 10 seconds, the reminder will be delayed for half an hour. If it reaches 20 seconds, the reminder will be delayed for one hour;
3. The current time point is within the reminder time range set by you (note that the Do Not Disturb function during lunch break is enabled, the default is 12:00~14:00); 
4. There is no standing reminder during the workout.
 

15. Q: What is the reminder logic of the Xiaomi Watch S4's standing reminder?

A: A standing reminder will be sent when all the following conditions are met:
1. Standing reminder is turned on in settings;
2. The 50th minute of each natural hour (49'59") determines the following conditions:
(1). You have not completed [Hourly Standing] in the current hour;
(2). The time off the wrist should not exceed 10 seconds between 49'00" and 49'59", and it should also be worn when reminding;
(3). This minute is [inactive] (number of active steps < 3);
(4). In the first 50 minutes of this hour, the [not wearing state] time is <5 minutes and the [sleeping state] time is <5 minutes and the [power on] time is >30 minutes;
(5). The current time point is within the reminder time range set by you (note that the do not disturb function during lunch break needs to be enabled, the default is 12:00-14:00).
3. The sleep algorithm determines that the stand-up reminder will not be issued after falling asleep; do not disturb mode and sleep mode will issue notifications but not reminders;
4. When you initiate exercise, the standing reminder will not be issued during exercise mode.
 

16. Q: How to delete exercise data from the Xiaomi Watch S4?

A: 1. On the watch, swipe to the second-to-last page of the workout record, as shown in the image below, and tap [Delete record] to delete it;
2. Open a single exercise record in the exercise record on the Mi Fitness APP and tap on the upper right corner to support manual deletion.

 

17. Q: Can the Xiaomi Watch S4 be set to automatically pause during exercise?

A: Yes, outdoor running, indoor running, walking, and cycling support auto pause by default. If you need to turn it off, you can turn it off in the sports settings. For example: Select [Outdoor running] >> [Settings] >> turn off [Auto pause].

 

18. Q: Why is the data displayed on the Mi Fitness APP inconsistent with the data displayed on the Xiaomi Watch S4 after syncing?

A: Due to the definition of the dual-end mutual writing synchronization protocol of Mi Fitness APP, according to your usage habits, there will be a minimum data difference of 5 minutes and a maximum of 30 minutes after completing automatic synchronization or manual synchronization. For example, after synchronization, If there is a minimum 5-minute data difference, the calories and steps data generated within the 5 minutes will not be reflected until the next synchronization. This setting is currently being interpreted and continuously optimized by Mi Fitness APP engineers.
 

19. Q: Why the number of swimming lap counts on the Xiaomi Watch S4 is inaccurate?

A: The identification of swimming laps needs to be calculated based on the movements during swimming. When swimming, please make sure to wear the wearable device properly and tightly.
At the same time, engineers are actively solving and optimizing the problem that the current known swimming laps are inaccurate. Please wait for subsequent upgrades.
 

20. Q: Why the mileage record of the Xiaomi Watch S4 is inaccurate? (During outdoor exercise, the phone recorded 6km, but the watch showed only 5km.)

A: When exercising outdoors, distance calculation depends on positioning information. Please choose an open field as much as possible when exercising outdoors to ensure better positioning accuracy. At the same time, the Xiaomi Watch S4 supports intelligent selection of positioning signal sources when connected to a mobile phone. Therefore, it is recommended to check whether the mobile phone has given complete positioning permissions to the Mi Fitness APP to improve distance accuracy.
 

21. Q: Is the maximum oxygen uptake displayed in the APP of the Xiaomi Watch S4 inaccurate compared to other products?

A: This problem is a known problem. This problem has been optimized in the latest software version. Please press and hold the watch power button (down button) for 12 seconds to force restart. After the watch restarts and the screen lights up properly, open the Mi Fitness APP, and in the APP tap [Check for updates] on the device interface and follow the reminder instructions to update to the latest software version.
 

22. Q: After completing a triathlon, why is the movement track graph displayed differently on the Xiaomi Watch S4 and the mobile phone?

A: This bug has been fixed in the latest firmware version of the watch. Please tap [Check for updates] at the bottom of the Mi Fitness APP device page, update the watch to the latest firmware version and try again.
 

23. Q: Why is there a difference between the Xiaomi Watch S4 and competing devices in recording calories during exercise?

A: Reason: The calorie algorithm involves a lot. The personal information of the watch and competing products need to be consistent. Each manufacturer’s algorithm is different and there could be small-scale differences, which will continue to be optimized.
 

24. Q: How to use warm-up stretching before and after exercise on the Xiaomi Watch S4?

A: In the waiting page for sports types that support warm-up, you can tap [Warm-up] to start the warm-up. After finishing the exercise, you can tap [Stretching] under the exercise report to do stretching.
 

25. Q: How to measure the lactate threshold on the Xiaomi Watch S4?

A: The Xiaomi Watch S4 does not support lactate threshold measurement.
 

26. Q: How to set the metronome on the Xiaomi Watch S4?

A: In the exercise settings, you can set the metronome. Additionally, during the exercise, you can press and hold the upper button to enter the exercise tools and select the metronome settings.
After connecting the watch to the Mi Fitness APP, you can set the metronome: Open the Mi Fitness APP >> [Workout] >> [Outdoor running] >> [Settings] >> [Metronome].

 

27. Q: How to set the AI pacer on the Xiaomi Watch S4?

A: You can open [Workout] >> [Outdoor running] >> enable [AI pacer]. After enabling it, an additional AI pacer page will appear during the exercise.

 

28. Q: How to turn on the Route on the Xiaomi Watch S4?

A: Open [Workout] on the watch >> [Outdoor running] >> tap [Route]. Select a specific route from the list, enter the route overview page, and tap [Start] to begin the AI-guided route during the exercise.


Import method:
There are 3 ways to import routes into the route library. Only the tracks successfully imported into the route library can be transferred to the watch.
1. Open a single exercise record, tap the top right corner [Export], and select [Export to my route library];
2. Open third-party software and export the track route file in KML/GPX format. Choose [Mi Fitness] to open the file and save the track;
3. Tap the track route file, select [Mi Fitness] to open the file, and save the track.
To import routes to the watch:
Open [Workout] >> Running route >> Choose a route >> tap the top right watch icon to import it to the watch.
After connecting the device, you can go to Mi Fitness APP >> [Device] >> [Fitness and health] >> enter watch route management, select import from route library to view, import, or delete the route files on the watch. When transferring route files, ensure the watch and Mi Fitness APP are successfully connected. You can confirm the connection by manually syncing.
 

29. Q: How to adjust the item order on the workout interface of the Xiaomi Watch S4?

A: This product currently does not support manually adjusting the item order on the workout interface. The items are automatically sorted based on the usage frequency of the workout modes.
 

30. Q: Why can't the Xiaomi Watch S4 record the training load when doing indoor exercises such as strength training and stair climbing machines without fatigue values?

A: The training load on the Xiaomi Watch S4 can be managed through the Training state APP on the watch.

 

31. Q: How to enable the Skiing fall detection function on the Xiaomi Watch S4?

A: The watch and phone are properly connected. Here's how to enable the feature:
1. On the phone: Open the Mi Fitness APP >> [Device] >> [Security] >> [Emergency SOS]. Enable Emergency SOS and Fall detection (make sure to set up emergency contacts).
2. On the watch: When entering a skiing workout, security settings popup will appear. Tap [Security] >> turn on [Skiing fall detection] and [Skiing emergency call] to select the appropriate emergency call method.
Note:
Fall detection and emergency call for skiing need to be enabled and configured in the Safety Settings page of any skiing mode. To use the emergency call feature, ensure the watch is connected to the Mi Fitness APP on the phone.
 

32. Q: How to activate the training experience on the Xiaomi Watch S4?

A: 1. Open the exercise settings for any workout >> enable the [Training experience] option >> start the workout >> after completing the workout, a page will appear prompting you to select your training experience >> choose your experience >> tap [√], and then view the selected experience in the workout report;
2. Check the synced training experience in the Mi Fitness APP on your phone.

 

33. Q: How to check the running form data on the Xiaomi Watch S4?

A: Start an exercise that supports the running form. You can view the running form data during or after the exercise.

 

Handy tool

1. Q: How to use the schedule on the Xiaomi Watch S4?

A: After turning on Mi Fitness APP >> [Device] >> [Apps] >> [Sync events], every time data is synchronized, the device will synchronize the mobile phone system schedule for the last 7 days. Sync events only support MIUI system and iOS, and other systems are not supported yet.
Quantitative restrictions:
The upper limit of all schedules is 20 (sorted according to the schedule list), and the excess will not be displayed. Each schedule has a maximum of 195 bytes (1 byte for English letters and punctuation marks).
1. The title can display up to 90 bytes (including punctuation marks). If the displayed content exceeds three lines, three lines plus... will be displayed;
2. Remarks can display up to 45 bytes (including punctuation marks). If it exceeds 45 bytes, 45 bytes plus... will be displayed;
3. The address can display up to 60 characters (including punctuation marks). If it exceeds 60 bytes, 45 bytes plus... will be displayed.
 

2. Q: How to use the calendar on the Xiaomi Watch S4?

A: When the watch is connected to the mobile phone, the viewing method is as follows:
1. Tap the up button on the home screen, select the calendar application in the application list, and view it. The title displays the time. Tap the left and right buttons on the title to switch months. It also supports sliding left and right to switch months. Display time: 2000~2060. If enabled Sync events, dates with schedules in the next seven days will be marked with dots, and there will be a "today" mark below the non-current month. Tap it to return to the current month and tap the date to enter the list page;
2. Tap the date to enter the list page, slide up or down to switch the date, display date, week, and holiday information, the next seven days are highlighted, or no schedule is displayed. If there is 1 schedule, the schedule is displayed in one row. If the content cannot be displayed, use... instead. If the schedule is greater than 1, "How many schedules are there in total" will be displayed. Tap the list to enter the schedule. For details, please refer to the schedule application;
3. Schedule page: Please refer to the schedule application for specific usage.
 

3. Q: How to check weather information on the Xiaomi Watch S4?

A: When the watch is connected to the mobile phone, the viewing method is as follows:
1. Tap the up key on the home screen, select the weather application in the application list, and view it. You can get the local temperature, weather conditions, AQI (air quality) pollution, air quality forecast, wind level, ultraviolet rays, intensity, relative humidity, sunrise and sunset times, and weather forecast for the coming week by scrolling up and down;
2. Swipe the screen left or right on the homepage of the watch face to view the weather widget to get temperature and weather condition information. Tap the widget to enter the weather APP to view more information.

Note:
To use the watch to check real-time weather, you need to keep your phone connected to the watch, and the Weather updates function of the Mi Fitness APP is turned on.
1. If the watch is not connected to the mobile phone;
(1). The disconnection time does not span days and does not exceed 2 hours. The locally cached weather data is displayed correctly;
(2). If it exceeds 2 hours, it will show that the data has expired. You need to reconnect the device in the APP and turn on the weather updates switch, and the weather information will be automatically updated.
2. The weather information displayed on the watch is obtained by the Mi Fitness APP from the service provider and pushed. If it is different from the weather service provider used by the mobile phone system, the displayed results could be slightly different.
 

4. Q: How to use the stopwatch function on the Xiaomi Watch S4?

A: 1. Open [Stopwatch] in the application list;
2. Tap it to start timing. During the timing process, tap the [Scoring] button or tap the shortcut key to generate scoring data. In the scoring record display area, slide the screen up and down to view all scoring records, and up to 50 scoring records can be displayed;
3. Tap the [Clear] button to clear the stopwatch data.
Note:
The stopwatch application does not support running in the background. Exiting the stopwatch will clear all timing data.
 

5. Q: How to use the Timer function on the Xiaomi Watch S4?

A: The watch provides 1 minute, 2 minutes, 3 minutes, 5 minutes, 10 minutes and 30 minutes timer by default. You can also customize the time to adapt to the needs of different scenarios.
The settings are as follows:
1. Open [Timer] in the application list;
2. Select a number and start the countdown directly after tapping it. You can also tap [Custom] to set the time you need;
3. After the countdown is over, the watch will vibrate and ring as a reminder (the ring volume is the alarm volume). You can tap the screen to turn off the countdown reminder or start a new countdown.
 

6. Q: Does the Xiaomi Watch S4 support the function of finding phone/finding device?

A: The Xiaomi Watch S4 supports the function of finding phone on the watch and finding device on the phone. When the phone and watch are connected via Bluetooth, if the phone cannot be found, you can use the find phone function on the watch.
To find the phone:
1. Enter the [Find phone] APP in the application list and tap [Search];
2. You can start looking for the phone through voice; 
3. During the search process, tap [Stop] to end the search state.
To find the watch:
1. Open the Mi Fitness APP >> [Device] >> [System] >> [Find device] >> [Find device]; 
2. During the search process, tap [Stop] to end the search state.
Note:
If Bluetooth is not connected, the phone search function prompt is unavailable.
 

7. Q: Does the Xiaomi Watch S4 support the compass function?

A: The Xiaomi Watch S4 supports the compass function. Open the Compass APP from the APP list, and follow the on-screen instructions to rotate the watch for calibration. Once calibration is complete, you can use the compass for navigation.
Note:
External magnetic fields can affect the geomagnetic sensor of the watch. To ensure accuracy, keep the watch away from magnets, phones, or other magnetic objects while using the compass.
 

8. Q: When does the compass on the Xiaomi Watch S4 need to be calibrated?

A: Calibration is not required every time you open the Compass APP. When the APP detects significant magnetic field changes that can affect data accuracy, it will prompt calibration.
Note:
Strong magnetic fields in the environment can interfere with the proper functioning of the compass.
 

9. Q: Does the Xiaomi Watch S4 support checking the altitude and barometric pressure?

A: The Xiaomi Watch S4 supports altitude and barometric pressure tracking. Open the Barometer APP from the APP list on your watch to view the current pressure, historical highest and lowest pressure (in hPa, rounded to the nearest whole number), and the altitude value by swiping left. The altitude range is from -200 to 9000 meters, and the barometric pressure range is from 300 to 1100 hPa.
Note:
1. Altitude readings can be influenced by the surrounding environment and are for reference only;
2. If there is a significant deviation, update your watch to the latest firmware via the Mi Fitness APP and try again;
3. Data inaccuracy can occur if the APP has not been synced for a long time. Sync it to update the data.
 

10. Q: How to set an alarm on the Xiaomi Watch S4?

A: The Xiaomi Watch S4 supports alarms with vibration and ringtones (alarm volume matches the set alarm tone). You can set multiple and recurring alarms.
To set an alarm on the watch, please refer to the following steps:
1. From the watch face, press the power button to access the APP list;
2. Open the Alarm APP, and create a new alarm. Set the desired time. If no repeat dates are selected, it will be a one-time alarm;
3. Select repeat dates for recurring alarms. Tap [√] to save the settings.
When the alarm triggers, it will vibrate and ring. Press a button or tap [Snooze] on the screen to delay the alarm by 10 minutes. Tap [Turn off] to stop the alarm completely.
If you want to delete an alarm, please go to the APP list of the watch >> open the [Alarm] APP >> select the alarm >> tap the delete icon to remove it.
 

11. Q: How to disable the vibration or ringtone for alarms on the Xiaomi Watch S4?

A: The alarm vibration cannot be disabled. However, you can delay the alarm by pressing the power button or tap [Snooze], which snoozes it for 10 minutes.
To disable the ringtone, please go to the [Settings] APP on your watch >> tap [Sound and vibration] >> you can see the alarm volume on the watch and set the volume to 0. Alternatively, you can go to the APP list of the watch >> open the [Alarm] APP >> select the alarm >> enable [Vibration only] in the alarm editing interface.
 

12. Q: What is the Sleep mode on the Xiaomi Watch S4, and how to use it?

A: To set up the Sleep mode, please refer to the following steps:
1. Open the [Mi Fitness] APP;
2. Enter [Device];
3. Select [System];
4. Enter [Sleep mode] and set custom schedule time. Select to sync with the phone's schedule (for MIUI system) or customize the bedtime and wake-up time (for non-MIUI system), and wait for the watch to successfully sync.
After enabling Sleep mode, daily reminders will be triggered. When the watch reaches the bedtime, it will remind you to go to sleep and automatically activate Do Not Disturb mode, disabling the Raise to wake feature. When the watch reaches the wake-up time, an alarm will sound, similar to the one set on the watch, and once you dismiss the alarm, the watch will automatically exit Do Not Disturb mode and activate Raise to wake. For non-MIUI phones, after dismissing the alarm, an early report will pop up, displaying sleep duration and today's weather information. For MIUI phones, the wake-up early report will only appear on the phone and not on the watch to avoid duplication.
 

13. Q: How to use remote control phone photography feature on the Xiaomi Watch S4?

A: The remote control phone photography feature can be activated in three ways: Tap the shutter icon on the Camera APP on your watch, set it as a shortcut key (power button), and use gesture triggers. All three triggering methods must be performed while the watch's Camera APP is open.
Note:
1. This feature cannot launch the phone's Camera APP. Open the Camera APP on your phone before using the function;
2. Ensure the watch is connected to the phone and the Mi Fitness APP is running in the background;
3. If the feature doesn’t work, ensure fewer than seven devices are connected to your phone via Bluetooth.
 

14. Q: Does the Xiaomi Watch S4 support syncing alarms with phones?

A: For MIUI phones, alarms set on the phone can be synchronized with the Xiaomi Watch S4 for reminders. This feature is not available for non-MIUI phones.
Alarms will trigger on both the phone and watch simultaneously. Actions taken on either device (e.g., snoozing or stopping) will apply to both.
Alarm reminders can be synced to the Xiaomi Watch S4, provided that the Bluetooth connection between the phone and the watch is stable, and the Mi Fitness APP is running properly.
Note:
You can disable the alarm notification on the Mi Fitness APP.
 

Watch face related

1. Q: How to change and delete the watch face of the Xiaomi Watch S4?

A: To change the watch face, please refer to the following methods:
1. On the watch, you can swipe up to enter the control center >> tap the settings icon >> [Home screen] >> select [Watch faces] to make the change. Alternatively, press and hold the main interface of the watch for 2 seconds to enter the watch face selection page. Swipe left or right to switch between available watch faces. Both the system pre-installed watch faces and any previously downloaded or changed watch faces will be displayed on the watch face selection page;
2. To change the watch face through the Mi Fitness APP, please ensure the watch is connected to the phone. Open the [Mi Fitness] APP >> go to [Device] >> enter [Manage watch faces] >> tap the watch face you want to change to and apply it.
Note:
Due to the large memory usage of watch faces, to ensure the smooth operation of the watch's system, if too many watch faces are added, you will not be able to add new ones. A memory shortage warning will appear during the download process.
To delete the watch face, please refer to the following methods:
1. Open the [Mi Fitness] APP >> go to [Device] >> enter [Manage watch faces] >> tap the downloaded watch face and tap [Delete] to remove it;
2. On the watch, you can press and hold the main interface of the watch for 2 seconds or go to [Settings] >> [Watch faces] to enter the watch face selection screen. Swipe up on the watch face to display the delete icon, tap it to remove the watch face.
 

2. Q: Can the watch face background be customized on the Xiaomi Watch S4?

A: The Xiaomi Watch S4 supports custom watch face backgrounds (requires updating to the latest system). This feature can be achieved through the Mi Fitness APP.
To set the custom watch face, please open the Mi Fitness APP and ensure the device is correctly connected and synced. Navigate to the [Device] page >> tap [Manage watch faces] to enter the watch face management page. Find and select album watch face >> download and install >> select a picture and change the background image >> choose the position to keep the image >> select a watch face style and then confirm your set. Additionally, you can also find and select portrait watch face >> download and install >> select a picture and change the background image >> choose the position to keep the image >> select a watch face style and then confirm your set.
Both the album watch face and portrait watch face allow multiple background images. When the screen is on, each tap will cycle through the background images.
Note:
Different styles allow you to display different data items on the watch face, such as steps, heart rate, battery level, and weather.
 

3. Q: Why does the Xiaomi Watch S4 not automatically turn on the Always-on display watch face?

A: After enabling the Always-on display function, the screen will automatically turn off during sleep or when the watch is removed. Once you wake up, the Always-on display will function normally after the first screen activation (via raise to wake or button press) and the subsequent screen-off.
 

4. Q: Does the Xiaomi Watch S4 support custom watch face content?

A: The Xiaomi Watch S4 supports customizable watch faces. When switching watch faces, a customizable watch face will display [Edit] below, allowing you to personalize the watch face.
 

5. Q: What is the battery usage level of the Xiaomi Watch S4?

A: The watch face editing interface now includes a battery usage level. After entering the watch face editing page by pressing and holding the watch face, the battery usage level is displayed below the watch face name.
The battery usage levels of watch faces are displayed using different colors:
1. Power level 1: Represented by a light color;
2. Power level 2: Represented by a darker color;
3. Power level 3: Represented by red, indicating the highest battery consumption.
The introductions of different battery usage levels are as follows:
1. Low battery usage: Applying this watch face can help increase battery life;
2. Medium battery usage: Applying this watch face will reduce battery life by 10%;
3. High battery usage: Applying this watch face will reduce battery life by 20%.
 

Screen related

1. Q: Why does the Xiaomi Watch S4 screen have slight color deviation when displaying at low brightness?

A: Due to the inherent properties of current OLED materials, the activation voltages for the RGB colors differ. As a result, a slight color shift can occur when the screen is displayed at low brightness, but this phenomenon disappears as the brightness increases. This is a normal occurrence, so please rest assured while using the device.
 

2. Q: Why can stripes be seen on the Xiaomi Watch S4 screen at certain angles, and why does the watch exhibit graininess in low-brightness scenarios?

A: The Xiaomi Watch S4 uses an OLED display, which includes a very thin layer of polarizer film. The thinner the film, the more it tends to shrink in the direction perpendicular to its stretch during the manufacturing process, leaving visible streaks once it adheres to the base material. This is an inevitable phenomenon, so please rest assured while using the device.
The brightness levels of different pixels on the display can vary, leading to visible differences in brightness across different areas. In low-light conditions, you will be more sensitive to these variations. This is a natural occurrence, so please rest assured while using the device.
 

3. Q: Why is the Xiaomi Watch S4 screen unable to light up?

A: If the watch screen remains off and neither raising your wrist nor pressing the power button or rotating crown turns it on, please try the following steps:
1. It can be due to insufficient battery. Please connect the Xiaomi Watch S4 to the charging dock and check if the battery level is sufficient;
2. Press and hold the power button for 12 seconds to force restart the watch. After restarting, check the watch's version and update it to the latest version.
 

4. Q: Why is the Raise to wake feature of the Xiaomi Watch S4 not responsive?

A: The functionality relies on the accelerometer inside the Xiaomi Watch S4. Actions such as flipping the wrist or raising the wrist can wake up the screen. However, if the wrist flip angle is too small or the motion is too slow, it can result in the screen not turning on.
 

5. Q: What to do if the Xiaomi Watch S4 screen displays distortion or artifacts?

A: It is recommended to press and hold the power button for 3 seconds to restart the Xiaomi Watch S4 before using it.
 

Notification related

1. Q: Does the Xiaomi Watch S4 support receiving notifications from the phone? How to view and manage notifications?

A: The Xiaomi Watch S4 supports receiving notifications from the phone. After enabling the APP notifications in the Mi Fitness APP, and with the watch and phone connected, you can sync and view phone notifications on the watch. The watch can only view notifications and does not support replies.
To enable this function, please open the [Mi Fitness] APP >> enter the [Device] page >> select [Notifications and calls] >> tap [App notifications] and enable it. You can either select [Mirror phone notifications] to sync notifications from all phone APPs to the watch or choose specific APPs for notifications.
Note:
For APPs enabled in the Mi Fitness APP, ensure notification permissions are also enabled on the phone.
To view the notifications, please refer to the following steps:
1. When the watch and Mi Fitness APP are connected, messages received on the phone’s notification bar will sync to the watch;
Note:
By default, the watch will only vibrate and not turn on the screen when a notification is received. You can use the Raise to wake feature or manually turn on the screen to view the notification details. If you want the watch to turn on the screen when receiving a notification, open the [Mi Fitness] APP >> enter the [Device] page >> select [Notifications and calls] >> tap [App notifications] and enable it >> enable [Wake up].
2. On the main interface of the watch face, swipe down to open the notification shade and view the received notifications.
To delete notifications, please refer to the following methods:
1. When the watch and the Mi Fitness APP are connected, notifications that have been read on the phone will automatically be deleted from the watch;
2. You can delete the notification on the notification detail page on the watch. If the watch and the Mi Fitness APP are connected, the notification will also be deleted from the phone;
3. In the notification detail page on the watch, you can check the notification on your phone, and the notification will be deleted from the watch, while the phone will open the corresponding APP for that notification (this feature is supported only on some Android phones, and requires the watch and the APP to be connected);
4. In the notification shade on the watch, swipe left on a notification in the list to delete it, or tap [Clear all] at the top of the list to delete all notifications.
Note:
1. Turning off or restarting the watch will clear all notifications;
2. The watch can store a maximum of 50 notifications. If the number exceeds 50, new notifications will overwrite the oldest ones.
 

2. Q: Why doesn’t the Xiaomi Watch S4 receive notifications from the phone?

A: When the Mi Fitness APP maintains a Bluetooth connection with your Xiaomi Watch S4, it pushes notifications from the phone’s notification bar to the watch, notifying you of new notifications on the phone. However, if there are no notifications displayed in the phone's notification bar, the watch will not receive any notifications, even if the phone's APPs have new notifications.
If you find that you're not receiving notifications, please follow these steps to troubleshoot:
1. Ensure that the phone has a stable network connection, Bluetooth is enabled, and the phone is properly connected to the watch;
2. Make sure that notifications are set to display in the phone's notification bar;
3. Check if the APP notification option is enabled in the Mi Fitness APP;
4. Verify whether the watch is in Do Not Disturb or Sleep mode. During these periods, the watch will not vibrate to alert you of new notifications;
5. Check if the wearable only is enabled on the watch. With this switch turned on, the watch will only receive notifications while being worn;
6. If your phone is running on the Android system, it is recommended to enable background running permissions to ensure that the APP operates properly in the background.
 

3. Q: What is the message display limit (character count and number of messages) for the Xiaomi Watch S4?

A: The message display supports approximately 16 lines. Any text beyond that will be truncated.
The Xiaomi Watch S4 can receive up to 50 notifications. if more than 50 notifications are received, the new messages will overwrite the earliest ones.
 

4. Q: Does the Xiaomi Watch S4 support incoming call notifications?

A: The Xiaomi Watch S4 supports incoming call notifications. When connected to the phone, the watch will vibrate and ring when there is an incoming call, displaying the caller's number or name (if contacts permission is granted). You can reject the call by tapping the red phone icon or answer it by tapping the green phone icon on the watch screen.
Note:
1. The name displayed for incoming calls will match what is saved in the phone's contacts, while unknown numbers will display the phone number;
2. If Do Not Disturb mode is activated, incoming call notifications will be muted during the designated period.
 

5. Q: What to do if the Xiaomi Watch S4 does not receive incoming call notifications?

A: The Xiaomi Watch S4 supports incoming call notifications and is enabled by default. Ensure the Mi Fitness APP is running in the background (check permissions such as background process lock, background auto-start, and background high battery consumption).
In your phone's Bluetooth settings, confirm that Bluetooth audio is enabled for the connected watch (this feature is enabled by default, and turning it off will prevent call notifications).
 

6. Q: Does the Xiaomi Watch S4 support Bluetooth disconnection alerts?

A: The Xiaomi Watch S4 does not support Bluetooth disconnection alerts. However, you can check the Bluetooth connection status in the status bar of the watch's control center.
The icon for Bluetooth connection and disconnection is shown below:

The icon for Bluetooth connection is shown below:

 

7. Q: How to use Emergency contacts on the Xiaomi Watch S4?

A: The Xiaomi Watch S4 supports setting up Emergency contacts. To enable and call emergency contacts, the watch must be connected to the Mi Fitness APP.
To enable Emergency contacts, please open the Mi Fitness APP on your phone, go to [Device] >> enter [Emergency SOS] and enable it >> tap [Set emergency contact] to set the phone number and notes. The settings will automatically sync to the watch.
To call an emergency contact, you can press the power button three times in quick succession to call your emergency contact (this syncs with the phone's dialing system).
 

8. Q: How to use the Fall detection of the Xiaomi Watch S4?

A: Fall detection must be enabled and set up in the Mi Fitness APP. After binding and connecting the Xiaomi Watch S4, go to the Mi Fitness APP >> enter [Device] >> tap [Emergency SOS] >> enable [Emergency SOS] and [Fall detection].
Note:
1. To enable Emergency SOS, emergency contacts need to be added the first time it’s used;
2. The device can not detect all falls and can mistakenly identify activities with high impact as falls, triggering alerts and emergency help;
3. When the watch detects a fall while worn, it waits for approximately 20 seconds to determine whether you are active. If no activity is detected, it will send the alert. If no action is taken within 60 seconds after the reminder, the watch will automatically call for help;
4. The watch must be connected to the Mi Fitness APP for it to make emergency calls and send notifications. If you connect to other brands of mobile phones, sending help messages can be restricted due to system limitations.
 

9. Q: How to use the Favorite contacts of the Xiaomi Watch S4?

A: To add favorite contacts, ensure the Xiaomi Watch S4 is connected to the Mi Fitness APP, then go to [Device] >> [Favorite contacts] >> [Add]. This will open the phone's contact selection page (ensure that the APP has access to contacts). Select the contact you wish to add, and it will automatically sync to the watch.
To call a favorite contact, ensure the watch is connected to the phone. Open the Favorite contacts APP on the watch, select the contact you wish to call (this will sync with the phone's dialer).
 

10. Q: How to check the call history of the Xiaomi Watch S4?

A: You can go to the APP list on your Xiaomi Watch S4 and enter the Phone APP to check the call history.
The call history includes 4 types of records: Missed calls, Calls ended on the watch, Calls answered on the watch, and Calls dialed from the watch. You can tap [Clear all] to delete all call history from the watch. You can also tap a record to initiate a call (this is synced with the phone).
Note:
The watch only stores the most recent 30 call records. Once 30 records are reached, new calls will overwrite the oldest ones.
 

11. Q: How to answer and make calls for the Xiaomi Watch S4?

A: For the issue you mentioned, you can refer to the following solution:
1. Answering calls on the watch: When the phone and the Xiaomi Watch S4 are connected, incoming call notifications from the phone are synchronized to the watch. You can accept or reject the call by pressing the respective icons on the watch (this syncs with the phone's actions);
2. Making calls from the watch: When the phone and watch are connected, you can dial a number using Favorite contacts, Emergency contacts, Call history, or Missed calls (this initiates the call on the phone);
3. Switching phone calls to the watch: While the phone and watch are connected, you can switch an ongoing phone call to the watch by changing the call device to the watch and continue the conversation on the watch.
Note:
1. There can be a sound issue during calls on the watch. This bug has been fixed in the latest firmware update. Please check for updates in the Mi Fitness APP under the Device page and update the watch to the latest firmware version;
2. Some phone models can experience a delay when hanging up a call on the watch, due to compatibility issues between the phone and the watch. This is a normal occurrence.
 

12. Q: When will the severe weather alert feature on the Xiaomi Watch S4 be triggered?

A: The severe weather and high-altitude low-oxygen alerts are designed to help prevent exposure to hazardous environments. The scenarios that trigger these alerts primarily include the following:
1. Storm warning: Based on atmospheric pressure changes in the last 3 hours, the Xiaomi Watch S4 predicts the risk of sudden weather changes in the next 1 hour, alerting you to the potential of an incoming storm;
2. High-altitude blood oxygen monitoring: When the Xiaomi Watch S4 detects an outdoor activity at an altitude of 2500 meters or higher, it automatically starts high-altitude blood oxygen monitoring. If the blood oxygen level drops to a warning threshold, the watch will alert you to avoid potential health risks caused by low oxygen levels.
 

Troubleshooting

1. Q: Why is the step counting on the Xiaomi Watch S4 inaccurate or not working?

A: The Xiaomi Watch S4 uses a built-in accelerometer to gather motion data, combined with algorithms and basic information (such as height, weight, and gender) to estimate steps and calories burned.
Factors affecting accuracy are as follows:
1. The walking distance is estimated using your height, weight, and gender to determine an average step length, which is then multiplied by the detected number of steps. Differences in step length between individuals can lead to inaccuracies;
2. Different height, weight, and gender can have different step lengths, causing deviations in calculations;
3. Factors such as arm swing amplitude, walking style, or specific activities (e.g., walking, driving, or showering) can influence step detection. The watch can misinterpret complex arm movements during such activities.
Due to the reasons mentioned above, the distance calculated by the watch is ultimately an estimated value. The watch is not intended to serve as a professional measurement tool for distance. Continuous optimization of the software algorithms will be carried out to improve the accuracy of these calculations.
Note:
The watch updates step counts multiple times per minute but does not provide real-time updates every second.
 

2. Q: Why is the GPS positioning of the watch slow?

A: Troubleshooting steps are as follows:
1. Positioning can be slower in complex environments (e.g., surrounded by tall buildings or near large water bodies). It is recommended to move to an open area and restart the positioning process;
2. If it has been a long time since your last outdoor activity, the satellite ephemeris data on the watch can have expired. Open the Mi Fitness APP, reconnect the watch, and refresh the synchronization to improve GPS positioning speed;
3. GPS positioning is not possible in locations such as indoors, basements, tunnels, indoor swimming pools, or sports arenas.
 

3. Q: Why does the watch still display pace information after stopping the workout?

A: Distance and pace during workouts require a brief calculation period. After stopping the activity (complete stillness), it takes approximately 10 seconds for the pace information to stop updating.
 

4. Q: Why doesn’t the Xiaomi Watch S4 vibrate?

A: To resolve this issue, please refer to the following steps:
1. First, check whether the vibration alerts are enabled and confirm that Do Not Disturb mode is turned off;
2. If the vibration alerts are not enabled, try restarting the watch. After restarting, set several alarms on the watch. If the screen displays the alarm notification but the watch does not vibrate, you can contact the local after-sales service center for further inspection.
 

5. Q: Why does the Xiaomi Watch S4 experience freezing, black screens, or failure to power on?

A: 1. Connect the Xiaomi Watch S4 to its charging dock and cable, and charge it for at least 10 minutes continuously;
2. If the device still does not power on after charging, try performing a forced restart by pressing and holding the power button for more than 12 seconds.
If the issue persists and the watch remains unresponsive, please contact the local after-sales service center for further inspection.
 

6. Q: Why does the Xiaomi Watch S4 display a black screen for several minutes before turning on during a system update?

A: This is normal behavior. Since the Xiaomi Watch S4 supports built-in applications, after the update progress bar is completed, the watch needs additional time to load, decompress, and install application resources. As a result, the screen can remain black for about 1-3 minutes before showing the boot-up screen.
 

7. Q: Why does the Xiaomi Watch S4 system upgrade fail?

A: 1. If the Mi Fitness APP or the Xiaomi Watch S4 shows an upgrade failure notification, try restarting the device and updating again;
2. Place the watch on the charger and ensure the battery level is above 20%, then attempt the update again;
3. Reset the watch, re-pair it with your phone, and try updating again;
4. Use a different phone to bind the watch and attempt the update;
5. If the upgrade fails and the watch cannot power on, please contact the local after-sales service center for further inspection.
 

8. Q: What to do if the system OTA update on the Xiaomi Watch S4 gets stuck at 100%?

A: If the watch's system OTA update is stuck at 100% and does not proceed, press and hold the power button (lower button) for 12 seconds to force a restart, and then try pushing the update again.
 

9. Q: Why does the Xiaomi Watch S4 have an odor when unboxed?

A: Upon unboxing the Xiaomi Watch S4, you can notice a faint odor. This is due to the material properties of the plastic components and packaging materials. Such odors can accumulate in a sealed environment during storage. This smell is harmless and will naturally dissipate after the product is left out in the open for some time. It does not affect the functionality or safety of the product.
 

10. Q: Why doesn't the weather update on the Xiaomi Watch S4?

A: The weather updates occur every 15 to 30 minutes.
If the weather information has not updated for an extended period, please follow these troubleshooting steps:
1. Open the Mi Fitness APP and check whether the Bluetooth connection between the Xiaomi Watch S4 and the phone is disconnected;
2. In the Mi Fitness APP, navigate to [Device] >> [Weather], and ensure that the [Weather updates] is enabled.
 

11. Q: Does the watch's charging dock and black strap easily attract dust?

A: The charging dock of the watch is equipped with protective stickers around its edges and on top, effectively reducing dust accumulation. It is recommended to clean any dust promptly when noticed during use.
The watch offers fluororubber and leather straps, both of which are treated to be hypoallergenic and skin-friendly. However, as with any wearable, exposure to dust is inevitable during use. Dust on black straps tends to be more visible, so regular cleaning is advised to maintain cleanliness.
 

12. Q: Why does the watch vibrate but not light up when a notification is received?

A: By default, the watch vibrates for new notifications without lighting up the screen. To view the notification, you can raise your wrist to wake the screen or manually turn it on.
If you prefer the screen to light up with notifications, enable this feature as follows:
1. In the Mi Fitness APP, go to [Device] >> select [Notifications and calls] >> enter [App notifications] >> toggle on the [Wake screen] setting;
2. You can also go to the Settings APP on your watch and enter APP notifications to enable [Wake screen].
 

13. Q: Why can't swipe the screen on the Xiaomi Watch S4?

A: 1. Check if the Xiaomi Watch S4's battery is too low;
2. Try holding the power button (lower button) for 3 seconds, then select [Factory reset] in the system options, and rebind the watch;
3. If the issue persists, press the rotating crown (upper button) to return to the watch face page. If swiping still doesn't work, you can force restart the watch by holding the power button (lower button) for 12 seconds.
 

14. Q: Why does the watch still go black even with the Always-on display feature enabled?

A: The watch can enter black screen mode in the following situations:
1. If the watch detects that it has been removed from the wrist for more than 5 minutes, it will automatically go black to reduce power consumption caused by the screen staying on;
2. If the watch detects sleep for 15 minutes, it will automatically turn off the display.
 

15. Q: Why does the Xiaomi Watch S4 fail to send a text message reply after receiving a call on the phone?

A: If your phone has dual SIM cards, currently, requires identifying the default SIM card for message sending. The design does not yet support dual SIM recognition.
 

16. Q: Why can't the watch connect to the network after a software update?

A: It is recommended to restart the watch to restore the network connection.
 

17. Q: Why does the watch screen have uneven colors?

A: This is caused by the background color and is not a quality issue. Please rest assured and continue using the device.
 

18. Q: Why does the Xiaomi Watch S4 produce noise from the speaker during swimming, or other similar activities?

A: When using the Xiaomi Watch S4 during activities like swimming, diving, showering, or washing hands, if you hear noise from the speaker, please use the watch's built-in drainage feature (repeat multiple times). To enhance the drainage effect, it is also recommended to perform additional wrist shaking movements to help expel water droplets from the speaker holes.
 

19. Q: Why is the Xiaomi Watch S4 not recognized when plugged into a computer?

A: It is recommended that you first connect your phone to the computer using the same data cable and check if the computer recognizes the phone. If the phone is also not recognized, please try updating the USB drivers and attempt the connection again.