Features:Smart thermostatic radiator valve that can be controlled by your phone before you come back home.Compatible with Alexa and Google Assistant for hands-free voice control.Create thermostat group to centralized control and support device sharing.Programmable/ manual mode switchable, 6 periods can be set each day.Detects opened windows by falling temperatures 6 within 4 minutes, the valve would close automatically.1 accuracy keeps temperature within the level you set.Keypad locking function is designed to prevent children from operating by mistake.With anti-froze function to prolong the service life of the device.Note: please purchase Tuya ZigBee gateway separetly.Specifications:Material: PVCColor: WhiteTemperature Sensor: NTCTemperature Accuracy: 1Display Range: 0~60Temperature Setting: 5~60Applicable Temperature: 0~50Frequency: 2.4GStandard Installation Size: M30 * 1.5mmPower Supply: 2 * AA Batteries (NOT INCLUDED)Item Size: 95.77 * 55.0mm / 3.8 * 2.2inPackage Size: 10.3 * 7.5 * 6.0cm / 4.1 * 3.0 * 2.4inPackage Weight: 80g / 2.8ozPackage List:1 * ZigBee Thermostatic Radiator Valve1 * Set of Installing Accessories1 * User Manual (English)