Product features -[ High ] The sensor uses top suppliers. It can the high of the measurement data. -[ Real-time Monitoring and Recording ] When the temperature and humidity change very little, the sensor report. You can view the changes in the values on the APP or the display screen. Record the changes in temperature and humidity on the APP and show them to you in graphics. -[ &] : The sensor is designed with a temperature conversion function between Celsius and Fahrenheit. You can select the units to be displayed as needed. The switching speed is related to the set data update frequency. The sensor is designed with a function to switch between Celsius and Fahrenheit temperature display. You can select the units to be displayed as needed. The zigbee version of the APP is more stable and less prone to disconnection (a ZigBee 3.0 gateway is required for use). Power supply: AAA*3 battery (battery not included) Backlight: Supported Wireless: WiFi 2.4GHz IEEE 802.11b /g Temperature measurement range: -10 to 55 Temperature accuracy: 1 Humidity measurement range: 10%RH to 99%RH Humidity accuracy: 5%RH 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.