Usage Tips: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 percent 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 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. This Thermostatic Radiator Valve comes with an LED display that clearly shows all information and functions, making it more convenient for you during use and easy to understand at a glance. 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 batteries) Ambient Humidity: 5-95 percent 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 percent Item Size: 92x58x58mm Package Size: 8686136mm Package Weight: 258.5g Package list: 1xThermostat Radiator Valve 1xUser Manual