1. Zigbee Smart Temperature Control Valve (TRV) is a self-controlled regulating valve installed on the radiator of the hot water heating system. 2. It controls the room temperature by changing the flow of hot water to the radiator. Using TRV, you can easily adjust the room temperature between 5-35 and save more than 15% of energy. 3. It is suitable for all common radiator valves and is easy to install without draining or intervening in the heating system. 4. Remote Access: Adjust your home's temperature from anywhere using your smartphone. 5. Energy Efficient: Helps in reducing heating costs by optimizing your heating schedules. Specifications: Wireless: Zigbee 3.0 Display: LED Temperature control accuracy: 0.5 Temperature setting range: 5-35c Temperature sensing element: 10K Working environment: 0-50 Valve connection: M30x1.5mm Battery: 2xAA 1.5V alkaline batteries Due to different batches, there may be differences in product appearance and printed text, which not affect use Colour:As shown Material:PC+ABS Package Contents: 1 * Temperature control valve 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.