Features: Wide temperature adjustment range: The thermostat radiator valve(TRV) can easily adjust the room temperature between 5-35, meeting different seasons and personal needs. Energy-saving and efficient: Using the thermostat radiator valve can save more than 15% energy, effectively reducing heating costs. Share devices with your family and create a smart home with your family. Easy installation: Suitable for all common radiator valves, no need to drain water or intervene in the heating system, easy and quick installation. Quick heating function: The additional heating function can quickly heat up the radiator in a short time, just open the valve for 5 minutes to enjoy the warmth. Ultra-quiet motor: The self-designed motor has a noise level of less than 25 decibels, ensuring a quiet environment during use. Multiple control methods: Can be controlled through a mobile application, convenient and easy to use; can also be used with Amazon Alexa and Google Assistant for voice control; LCD touch screen operation, sensitive buttons, easy operation. Note: The thermostatic radiator valve features a child lock mode, providing enhanced safety for families. The packaging does not have batteries. Specification: Color: Black/White(Optional) Power Supply: 3V/2XAA Batteries (Packaging does not have battery) Ambient Humidity: 5~95 % RH (Non-Condensing) Maximum stroke: 5.5mm Set Temp. Range: 5~45 Ambient Temp. : 0~45 Display Temp. Range: 0~70 Storage Temp. -5~45 conservation Class: IP 20 Accuracy: 0.5 Timing Error: 1% Buttons: Touch Button Item Size: 92*58*58mm Package Size: 8686136mm Package Weight: 259g Package list: 1*Thermostat Radiator Valve 1*User Manual