Thermostatic radiator valve(TRV)is a self-regulating valve fitted to hot water heating system radiator to control the temperature of a room by changing the flow of hot water to the radiator. With the TRV you can conveniently adjust the room temperature between 5-30, and save more than 15% of energy. The radiator thermostat fits to all common radiator valves and is easy to mount-without having to drain any water or intervene in the heating system. The additional boost function enables the radiator to be heated up quickly for a brief period of time by opening the valve for 5 minutes. There wil be a pleasant room temperature right because of the radiated heat. color: White material: plastic Package Contents: 1 x valve thermostat 1 x adapter (Shipped without 2 x AA battery) 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.