Key operation instructions1. Click the "+" or "-" button to switch to other functional test interfaces2. Long press the "M" key to enter the background, click the "+" or "-" key to switch between Chinese and English interface display, Click the "M" key to switch to the next option, click the "+" or "-" key to set Numerical value3. Long press the "+" or "-" button the device turn ON or OFF4. Click the "+" or "-" button to switch to the electricity bill setting interface, and then click the "M" button to set the unit price of the electricity bill. Click the "+" or "-" button to adjust the value. Long press "M" key to confirm OK5. Click the "+" or "-" button to switch to the security protection setting interface, and then click the "M" button to set the overvoltage protection, overpower protection, and undervoltage protection, click "+" or "-" key to adjust the value, long press the "M" key to confirm OKNOTES:This version is the WIFI version, the WIFI indicator will flash when it is turned on, but the Bluetooth indicator will not be displayed1. How to obtain AQI, PM2.5, air temperature, humidity data, calendar data?A: AQI, PM2.5, humidity, temperature, calendar and other data display are obtained through the Internet2. Are there any charges for data cloud?A: It's free3. What APP is supported and where can I download it?A: Currently Tuya APP and Smart Life APP are supported, which can be downloaded in major application markets (Google Play for Android, Apple App Store for IOS)