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 display with backlight for easy-to-read when dark. Includes °F/°C switching and summary of last 24hrs of data, plus a clean function to erase saved data. Support : 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 in house garage cellar greenhouse office and etc. Multifunctional: With low and prompt function. Wireless of data signals, mobile phone . low power consumption and long battery life. Specification: Power supply: AAA1.5V*3 (not including battery) Wi-Fi support: 2.4G 802.11 /n Temperature measurement range: -10~55 degree Temperature accuracy: ±0.3 Humidity measurement range: 0%~99%RH Humidity accuracy: ±0.3% RH Size Chart: 60*63*25mm Package Includes: 2 Piece Sensor 2 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!