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 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. Anti-demolition design in the field of professional secure,Split design, high reliability 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. With low voltage monitoring and prompt function. Wireless transmission of data signals, mobile phone remote monitoring. low power consumption and long battery life. Specification: Material: Plastic Size: 6.8x2.3x1.8cm/2.68x0.91x0.71inch Power supply: 1pc AAA battery (not included) Package Includes: 1 Piece Sensor(2 Pack) Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!