How to remotely control Xiaomi Smart Air Purifier 4 with a mobile phone?

Solution:

Use the mobile phone to scan the QR code on the manual or install the "Mi Home" APP through the Xiaomi app store, and bind the Xiaomi account to ensure that the Wifi at home can be connected to the Internet normally, the mobile phone is connected to the Wifi, turn on the purifier, and open the "Mi Home" APP. Home” APP, the APP will automatically search for nearby Xiaomi smart devices and prompt, or click the plus sign in the upper right corner to manually add devices. After adding Xiaomi Smart Air Purifier 4 according to the prompts, you can control the purifier on/off, switch the operating mode, check the current indoor air quality, temperature and humidity, etc. through the mobile APP.