This is a special thermostat for Water gas boiler. It is easy to install and precisely control the temperature, making your dailylife more convenient. (Note: Need to be used with Zigbee gateway, shipping does not include Zigbee gateway.) Features: Powered by battery, do not need plug, easy to install. Mobilephone App remote control from anywhere, anytime Simply give a voice command to Alexa or Google Home to control your devices. Three modes optional: manual mode, program mode, temporary program mode. 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. Backlight brightness adjustable: backlight can be adjust and turn off, to avoids disturbing sleep. Precise temperature control, more comfortable. Temperature calibration: display room temperature can be calibrate from 9.9C to -9.9C Anti-frost function: if the Water Gas Boiler is not turned on for a long time, the thermostat will automatically turn on for a short time. Children lock function is designed to prevents children from operating by mistake. Group control and family share function, control the device together with your family member. Specifications: Main color: white Main material: plastics Temperature precision: 1C Self-consumed: