It's time to shine
41mm AMOLED display with a slim, elegant design1
Upgraded health monitoring with sleep improvement plan2
Skin temperature tracking for enhanced female cycle prediction2
150+ sports modes with sports vlog4
Built-in security assistance for personal safety3
Up to 8 days of battery life under light usage5
Style on your wrist
Brilliant display
Stunning at a glance
Featuring a 1.32-inch AMOLED large display for crisp, fluid visuals, with an impressive HBM brightness of up to 1500nits.
466 × 466
resolution
60Hz6
Refresh rate
352PPI
Retina display
1500nits6
HBM
Compact watch
Slim design
The new 41mm diameter is compact, offering enhanced comfort and stylish versatility.
41mm
Diameter1
9.5mm
Thickness1, 7
32g
Weight1, 8
7. The thickness dimension exclude the protrusions.
8. Weight refers to the weight of the watch without the strap.
Premium materials
Elegance in every detail
Crafted from premium stainless steel with a sleek, minimalist finish for lasting durability and timeless appeal.
8-day battery life
Your long-lasting companion
Up to 8 days
Light usage9
Up to 4 days
Normal usage10
Up to 3 days
Heavy usage28
Multiple styles available
Suit every taste
Available in two designs with multiple combinations, you can define your own style and give your personality a signature colour.
Black
White
Sunset gold
Mint green
Sunset gold edition
Understated luxury
The shimmering edition features a lab-grown diamond set on the crown, and a Milanese strap - every detail crafted to reflect refined elegance.29
29. The availability of Sunset gold edition may vary by region. Please refer to the mi.com for more details.
Leather strap
Intellectual elegance
Crafted from premium leather for exceptional quality, the strap is sleek, stylish and offers a gentle fit on your wrist.
Fluororubber strap
Active energy
Made from fluororubber with a distinctive braided texture, it is soft, smooth and offers enhanced comfort, ideal for wearing during workouts.
Versatile style
Endless expression
Express your style with a choice of over 200 watch faces. Whether elegant or unique, they all create a stunning look on your wrist.11
Cute animal watch faces
Always by your side
Every time you turn on the screen, your pet will be there, adding a touch of cuteness and playful charm to your daily routine.
Pet Park
Exchange the calories you burn each day for food for your pet. Feed it, interact with it and watch it grow.
Sports health
All-new upgrades
Enhanced health monitoring
Featuring a high-precision heart rate module enhanced by proprietary algorithm, ensuring accuracy and stability during exercise.
Real-time heart rate display in swimming mode
5ATM12
Water resistance rating
The watch is upgraded to display your heart rate in real time while exercising. The post-workout report now includes a heart rate curve, aerobic/anaerobic training effects, load/recovery time and perceived exertion data.
Bluetooth heart rate broadcasting
Sync your heart rate via Bluetooth to bike computers - let real-time biometrics power your performance.13, 14, 15
Advanced sleep monitoring
Get a good night's sleep
The watch accurately tracks and analyses your sleep. We've also partnered with international sleep experts to provide tailored recommendations that can help you further improve your sleep quality.
World Sleep Society
Asian Society of Sleep Medicine
Chinese Sleep Research Society
Sleep trend report
Bedtime routine
Sleep score
Ideal sleep duration
Sleep improvement plan
Utilizing sleep data, it covers sleep schedule optimization, nap management, daytime activity, and pre-bed relaxation to enhance sleep quality.16
Skin temperature monitoring
Meticulous care
Equipped with high-precision contact-based temperature sensing, it can detect changes as small as 0.1°C, allowing you to constantly monitor your skin temperature and track trends over time.17, 18
Skin temperature measurement
Supports single measurements to help identify abnormal increases in skin temperature, such as a fever.
Overheat alerts
Enable all-day temperature monitoring and set alert thresholds. If your temperature exceeds the set limit, you will receive an alert.
Enhanced female cycle prediction
By combining other vital signs with menstrual history data, it delivers comprehensive cycle predictions, including period start days, ovulation days and fertile windows.19
One-tap health insights
Easy health monitoring
With the built-in Checkup app, a single tap provides quick health insights, including heart rate, blood oxygen, sleep and stress levels.20
All-day health monitoring
All-day blood oxygen saturation monitoring21
All-day stress monitoring21
Breathing exercises
150+ sports modes
Helps you keep fit
Professional skiing mode
Fall detection for safety
Now supports fall detection while skiing. If no response is detected within 60 seconds, the system will automatically call your emergency contact.22, 23
5-system L1+L5 GNSS
Independent workout tracking
Dual-frequency L1 + L5 GNSS supports five satellite systems for precise positioning and offers enhanced signal interference resistance, allowing you to track your outdoor activities with greater accuracy.
Personal safety guardian
All-scenario protection at your side
Emergency SOS24
Press the lower button three times to automatically call your emergency contact.
Emergency siren
When walking alone at night in poorly lit areas, tap to activate a loud siren to scare off suspicious individuals and attract attention.
Share location25
Send a live location sharing request to your emergency contact list, allowing real-time tracking for added peace of mind.
Health data at your fingertips
With Xiaomi's independently developed algorithm and the Mi Fitness app, Xiaomi Watch S4 41mm can monitor your health with greater accuracy. Now compatible with Health Connect and popular fitness apps like Suunto, it offers greater flexibility and convenience for your workouts.
*Xiaomi HyperOS 3 will be available via OTA from the end of September 2025.
Learn moreXiaomi Smart Hub26
Alongside the crown rotation interface, the watch’s intuitive vertical interaction framework has been redesigned. Control smart devices such as headphones, smartphones, tablets and more, directly from your watch for seamless connectivity and effortless operation.
Sports vlog
Record your energy and highlights
Remotely control your phone to start video recording during exercise, with real-time data such as heart rate and calories shown on screen.4
Convenient NFC payment
For contactless and cashless payments, simply tap your Xiaomi Watch S4 41mm against a payment terminal. Now supports Mastercard® and Visa®.27
Various widgets
Camera
Find your phone
Timer
Recorder
Flashlight
Compass
Stopwatch
Weather
Music
Tasks
World clock
Notes
1. Data obtained from Xiaomi Internal Labs. Actual results may vary.
2. This product and its features are not designed for medical purposes, and are not intended to predict, diagnose, prevent, or cure any disease.
3. This feature must be set up in the latest version of the Mi Fitness app. Send SMS and share location functions are only available on Android devices. For more details, please visit the product page at mi.com/global.
4. Sports vlog recording only available on Xiaomi and POCO phones. To use this feature, please ensure your watch firmware and the Mi Fitness app are updated to the latest versions.
5. The battery life data is based on light usage, tested by Xiaomi Internal Labs. Actual results may vary.
6. Screen refresh rates may vary slightly between interfaces; please refer to your actual experience. The HBM brightness is the maximum brightness when the entire screen lights up.
7. The thickness dimension exclude the protrusions.
8. Weight refers to the weight of the watch without the strap.
9. Light usage test conditions: With the watch fully charged using factory settings and the Elegant Prelude watch face, with high-precision sleep monitoring, all-day stress detection, and all-day SpO₂ monitoring turned off, heart rate monitoring every 10 minutes, 100 message notifications, 2 call reminders, 3 alarms, 8 NFC card uses and raising the wrist to light up the screen 300 times per day, 1 daily app data sync, 15 minutes of Bluetooth calls per week, 30 minutes of local music playback via headphones per week (local music playback only supported on Android), 90 minutes of weekly exercise recording (GNSS on) and 6 minutes of daily swipe operations. Data comes from Xiaomi Internal Labs.
10. Normal usage test conditions: With the watch fully charged using factory settings and the Elegant Prelude watch face, with high-precision sleep monitoring, all-day stress detection, and all-day SpO₂ monitoring enabled, using smart heart rate monitoring, 100 message notifications, 2 call reminders, 3 alarms, 8 NFC card uses and raising the wrist to light up the screen 360 times per day, 1 daily app data sync, 15 minutes of Bluetooth calls per week, 30 minutes of local music playback via headphones per week (local music playback only supported on Android), 180 minutes of weekly exercise recording (GNSS on) and 6 minutes of daily swipe operations. Data comes from Xiaomi Internal Labs.
11. Download more amazing watch faces from the Mi Fitness app. Actual watch face effects may differ from the images on this page. Please refer to the actual watch faces available in the Mi Fitness app.
12. 5ATM water resistance: Xiaomi Watch S4 41mm has a water resistance rating of 5ATM (equivalent to 50 meters in depth). The rating is based on the ISO 22810: 2010 standard. The test report number is 68.189.25.0133.02. The watch can be worn in swimming pools, while swimming near the shore, and during other shallow water activities. However, it cannot be used in hot showers, saunas, or while diving. Make sure to avoid direct impacts from swift currents during water sports. Water resistance is not permanent and may deteriorate over time.
13. When using the Bluetooth heartrate broadcast function, please ensure that your bike computer supports the BLE heartrate protocol and that the heart rate reception function is enabled for the best experience. Currently supported devices include:
• Bryton: e.g. R420, 750SE, S800
• Magene: e.g. C506, C606Pro
• Garmin: e.g. Edge 540, Edge 840
14. When using Bluetooth heart rate broadcasting, ensure your bike computer supports the BLE heart rate protocol and has heart rate data reception enabled for optimal performance.
15. Compatibility may vary by device model or firmware version. Please check your device settings in advance to confirm BLE heart rate protocol support and ensure proper pairing.
16. To use the sleep improvement plan feature, the Mi Fitness app needs to be updated to the latest version.
17. The all-day skin temperature monitoring feature must be enabled in the Mi Fitness app. Please enable Monitor while sleeping and High skin temperature alerts to use this function.
18. Skin temperature is not the same as body temperature.
19. To get enhanced female cycle predictions, please enable monitoring while sleeping under skin temperature or turn on smart period predictions in cycles in the Mi Fitness app.
20. To use the one-tap health insights feature, the Mi Fitness app needs to be updated to the latest version.
21. All-day blood oxygen saturation monitoring and all-day stress monitoring must be enabled manually. For details on monitoring frequency and methodology, please refer to the description in the app.
22. Fall detection while skiing and emergency calls must be enabled and set up on the safety settings page in any skiing mode. The emergency call feature requires the watch to be connected to the Mi Fitness app. The emergency contact information needs to be set in advance.
23. The watch may not detect all falls and may mistake high-impact activities for falls, triggering the alarm and initiating an emergency call. If no fall has occurred, you can tap the "I'm fine" option on the "Alarm" page to cancel the alert. When a fall is detected while wearing the watch, the alarm will be triggered after 20 seconds if no movement is detected. If the watch remains unoperated for 60 seconds after the alarm is triggered, it will automatically initiate an emergency call. The watch must be connected to the app to make emergency calls and send text messages. When connected to a non-Xiaomi phone, text messages cannot be sent due to system limitations.
24. Set your emergency contacts in advance and keep Bluetooth on to maintain connection with your phone. Update the Mi Fitness app to the latest version, then go to Device > Security > Emergency SOS to enable both Emergency SOS and Send SMS options. Send SMS function is only available on Android devices.
25. The function of location sharing only supports smartphones with Android 8.0 and above. Smartphones with iOS is not supported.
26. To use the Xiaomi Smart Hub, the watch needs to be connected to a Xiaomi smartphone or pad supporting the latest version of Xiaomi HyperOS and running the latest version of the Mi Fitness app and version 10.0 or above of the Xiaomi Home app.
27. Use of NFC requires a wireless service plan, which may be subject to certain restrictions when switching service providers or roaming (even after the contract expires). NFC cashless payments are only accepted at Mastercard® and Visa®-supported payment terminals. Availability of Mastercard® and Visa® payments, as well as NFC functionality, may vary by region. For more details, please visit https://www.mi.com/global/support/nfc-bank and contact your issuing bank for further information.
28. 3-day battery life on heavy usage was tested with the watch fully charged using factory settings and the Satin black watch face, Always-On Display (AOD) enabled, along with high-precision sleep monitoring, all-day stress detection, all-day SpO₂ monitoring, and heart health monitoring; smart heart rate monitoring activated; message notifications enabled (100 notifications/day), 2 call reminders, 3 alarms, 8 NFC card uses; raising the wrist to light up the screen 360 times/day; 1 daily app data sync; 15 minutes of weekly Bluetooth calls; 30 minutes of weekly local music playback via headphones (local playback only supported on Android); 180 minutes of weekly exercise recording (GNSS on); and 6 minutes of daily swipe operations. Data comes from Xiaomi Internal Labs.
29. The availability of Sunset gold edition may vary by region. Please refer to the mi.com for more details.
*The watch must remain connected to the smartphone via Bluetooth. Voice calls from third-party apps are not currently supported.
*Do not expose the smartwatch to strong magnetic fields as it may affect the functionality of the device.
*Product images, models, data, functions, performance, specifications, user interfaces and other product information are for reference only. Xiaomi may make improvements to the above content. Please refer to the actual product and product manual for specific information.
*Xiaomi HyperOS 3 will be available via OTA from the end of September 2025.