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 enjoy the appropriate temperature as soon as you get home. Features: Small design, do not occupy much 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. The historical temperature curve can be queried, and you can know the changes in room temperature. 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 Sensor: NTC Frequency: 2.4GHz Thread: M30*1.5mm Battery: 2 * AA battery not included) Working temperature-10- 40 Item size: 77 * 52mm / 3.0 * 2.0in Item weight: 146g / 5.1ounce Package size: 105 * 100 * 100mm / 4.1 * 3.9 * 3.9in Package weight: 230g / 8.1ounce Packing List: 1 * Temperature Controller 1 * User Manual 6 * Adapters