The temperature humidity sensor can monitor the temperature, humidity and atmospheric pressure, and can either then make changes to the environment of sending a notification to your phone via the APP. With the ability of matching with other smart devices such as gateway remote control, smart outlet, versatile controller, etc. This sensor is to help you create a smart home. What is more, this is easy to control the temperature and humidity change by viewing the data according to historical records. Wireless connection version: ZigBee Real-time and historical records Automatically alarm if the temperature, humidity and atmospheric pressure are abnormal Powered by a CR2032 button cell ( included ) Please download APP from the for Store or for Play temperature detection range: -20 ℃- 60℃ ( + / - 0.3℃ ) Humidity detection range: 0 - 100pct RH ( + / - 0.3pct ) Atmospheric pressure detection range: 30 - 110KPa ( + / - 120Pa ) No need to install, simple operation 1. Install the product in your home window,Use your phone to connect to WiFi,open the for MI ,"+"in the upper right corner to add the switch(Please pay attention to your model) 2.Follow the prompts. and hold the reset button for 3-5 seconds until the blue flashing light is on. The app prompt for each step of the operation. Until successful link Color: White Material: plastic Package Contents: 2 x Temperature Humidity Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.