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: Intelligent thermostat Radiator valve: With this practical auxiliary tool, the room temperature can be intelligently adjusted as required in your phone App. With clear screen to see and powered by 3*AA batteries (not included). The thermostat works with a Tuya Zigbee gateway. Voice Control - Compatible with Home and Alexa. Available to set the most comfortable temperature as you need by giving a command to the smart home system, which helps a lot when your hands are busy. Remote Control by App - Control your heating anytime and anywhere via the Smart Life app anytime and anywhere. What's more, free to share the device to other family members, allowing them to remotely control the TRV device. Weekly Temperature Program Setting - Available for 4 periods a day to set, 7 days weekly schedule, customized the required temperature for your house temperature. Auto mode, manual mode, and off mode are provided to select. Open-window Function - Once the thermostat radiator valve detect there is cold wind and falling temperatures 1.5℃ within 4-5 minutes, the valve would be activated. High compatibility - Comes with 6 various adapters and can be installed vertically or horizontally on almost all radiators with thermostatic radiator valves. Specification: Power: 3x1.5V LR6/Mignon/AA Battery (not included) Connection: M30 x 1.5 Attachment Kit: Danfoss RA Valves&RA Valves&RAL Valves Caleffi&Giacomini Valves, M28 Valves Size: 58.4x97x58.4mm Weight: 117.7g System Require: iOS 8, Android 4.4 Current Consumption: 100mA Max conservation Degree: IP20 Ambient Temperature: 0-50℃ Surface Temperature: 90℃ Max (at the radiator) Connection: M30 x 1.5mm Linear Travel: 4.3mm Package Size: 14x7x7cm/5.5x2.7x2.7in Package Weight: 240g/8.4oz Packing List: 1 x Radiator Thermostat 6 x Adapter Kit 1 x User Manual