Feature: 1. Powered by battery, do not need plug, easy to install. (Battery Not Included) 2. Mobilephone App remote control from anywhere, anytime 3. Simply give a voice command to Alexa or Google Home to control your devices. 4. Three modes optional: manual mode, program mode, temporary program mode. 5. Weekly Programmable: 5+2, 6+1, 7 days a week, 6 time slots on weekdays, 2 time slots on rest days, support different temperature setting and run in schedule. 6. With dormant switch, when open, the thermostat can not be controlled by the app during its sleep time. 7. Precise temperature control, more comfortable. 8. Temperature calibration: display room temperature can be calibrate from -9.9°C to 9.9°C 9. AntiFrost function: if the Water Gas Boiler is not turned on for a long time, the thermostat will automatically turn on for a short time. 10. Children lock function is designed to prevents children from operating by mistake. 11. Group control and family share function, control the device together with your family member. Specification: APP: SmartLife/TuyaVoiceControl: Amazon Alexa, GoogleProtocol: 2.4G Wi-FiTemperature sensor: NTCTemperature accuracy: ±1°CTemperature lag: 0.5~10°CTemperature correction: 0.1°CMinimum temperature setting: 0.5°CTemperature upper and lower limits: 15~95°CSelf consumption: