Mijia Bluetooth Hygrothermograph 

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High sensitivity sensor | LCD screen | Magnetic wall stickers | Ultra-low power consumption

The smallest scale value of 0.1, the measurement is more accurate
Built-in advanced Sensirion temperature and humidity sensor
Accurate and sensitive Sensirion temperature and humidity sensors, accurate perception of 0.1 degrees Celsius temperature changes and 0.1% relative humidity change, refresh once a second, the measurement more accurate.

Just a 7 battery, life up to one year
Easy to connect Mi Home APP
Open Mi Home APP.
Choose to add "Bluetooth device" to enter the connection interface