ZigBee Thermostatic Radiator Valve Programmable Smart Radiator Thermostat APP Control Voice Control Compatible with Alexa Assistant Window Opened Detection Anti Freezing Function（Zigbee Hub Required) Features: Smart thermostatic radiator valve that can be controlled by your phone before you come back home. Compatible with Alexa and 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: PVC Color: White Temperature Sensor: NTC Temperature Accuracy: ±1℃ Display Range: 0~60℃ Temperature Setting: 5~60℃ Applicable Temperature: 0~50℃ Frequency: 2.4G Standard Installation Size: M30 * 1.5mm Power Supply: 2 * AA Batteries (NOT INCLUDED) Item Size: 95.77 * 55.0mm / 3.8 * 2.2in Package Size: 10.3 * 7.5 * 6.0cm / 4.1 * 3.0 * 2.4in Package Weight: 80g / 2.8oz Package List: 1 * ZigBee Thermostatic Radiator Valve 1 * Set of Installing Accessories 1 * User Manual (English)