Tuya ZigBee Intelligent Constant Temperature Controller Temperature Adjustable LCD Display Controller Compact Size Water Gas Boiler Temperature Controller Compatible with Amazon Alexa and Home 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 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 9.9°C to -9.9°C 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: ±1°C Self-consumed: <170uW Battery: 3 * AA battery (not included) Load current: 3A (negative) Item size: 86 * 86 * 28mm / 3.4 * 3.4 * 1.1in Package size: 100 * 95 * 65mm / 3.9 * 3.7 * 2.6in Package weight: 263g / 9.3ounce Packing List: 1 * Temperature Controller