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 for and for google home, a simply 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. 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.(Note: Need to be used with Zigbee gateway, shipping does not include Zigbee gateway.) Child lock function avoids kid's operation on it. Make sure your home in intelligent and 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 more intelligent. Sensor:NTC Frequency:2.4GHz Thread:M30 x 1.5mm Battery:2 x AA battery (not included) Working temperature:-10-40 Colour:White Material:Plastic Package Contents: 1 * Temperature Controller 1 * English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.