This product is a radiator thermostat, suitable for home heating equipment. Convenient installation and simple operation. The temperature can be controlled through the mobilephone app, so that you can get the appropriate temperature as soon as you get home. (Note: Need to be used with Zigbee gateway, shipping does not include Zigbee gateway.) Features: Small design, do not occupy lots of space, avoiding collisions with human bodies or objects. Control the radiator thermostatic valves anytime and anywhere through the mobilephone app. Compatible with amazon alexa and google home, a simply command to voice control the TRV. Deeply customize the temperature according to your specific needs, and set the time and temperature more accurately. Support one week programming, set temperature for 4 time periods per day. The historical temperature curve can be queried, and you can know the changes in room temperature. When there is a difference between the ActualTemperature and the temperature displayed on the TRV, the calibration function can be used. The screen display direction and the screen display brightness can be adjusted. Child lock function avoids kid's operation on it. Make sure your home in intelligent and safer status. TRV can be set in group in different room, realize group control function in special scene. It can be linked with other intelligent devices, making homelife more intelligent. Specifications: Color: white Waterproof: IP20 Thread: M30*1.5mm Battery: 3 * AA battery not included) Working temperature: 0- 50 Surface temperature: max. 90 Linear travel: 6mm Item size: 100 * 60 * 60mm / 3.9 * 2.4 * 2.4in Item weight: 146g / 5.1ounce Package size: 140 * 76 * 66mm / 5.5 * 3.0 * 2.6in Package weight: 253g / 8.9ounce Packing List: 1 * Temperature Controller 1 * User Manual 6 * Adapters