Description: Our sensors use battery power supply. When the temperature changes, the temperature and humidity will be reported to the service immediately. You can view the changes in the value on the APP or display screen. The Thermometer Hygrometer features a crystal clearlarge LCD display with backlight for easy-to-read monitoring when dark. Includes °F/°C switching and summary of last 24hrs of data, plus a clean function to erase saved data. Support Voice APP: The sensor can be used as the temperature and humidity data source of Tuya APP, You can do many automated processes based on the data source. It support third-party voice support, you can check the current temperature and humidity by voice. Widely Used: You can put anywhere you want or simply place on any surface, for environment tracking anywhere in your home. Suitable for Thermometer Hygrometer monitoring in house garage wine cellar greenhouse office and etc. Multifunctional: With low voltage monitoring and prompt function. Wireless transmission of data signals, mobile phone remote monitoring. low power consumption and long battery life. Specification: Power supply: AAA1.5V*3 (not including battery) Wi-Fi support: 2.4G IEEE 802.11 b/g/n Temperature measurement range: -10~55 degree Temperature accuracy: ±0.3 Humidity measurement range: 0%~99%RH Humidity accuracy: ±0.3% RH Package Includes: 1 Piece Sensor 1 Piece Instrcution Book Note: Please allow slightly 0-1cm difference due to manual measurement. Colors can appear different depending on light and how the listing is viewed. Thanks for your understanding and attention. Wish you a pleasant shopping experience!