Antifreeze function.Child lock to prevent mishandling.Cordless, powered by AA batteries, can be placed anywhere. Easy to install on the wall or put anywhere.You can set 5 + 2 weekly programmable. < /p> Product Description Features: The gas boiler thermostat features a digital LCD display . Powered by two 1.5V AA batteries. It is used to start or stop the boiler to adjust the temperature. The thermostat detects the room temperature, and when the actual room temperature is lower than the set temperature, the thermostat controls the boiler when the work starts. When the actual room temperature is higher than the temperature you set , the thermostat controls the boiler to stop working. Description: Material: ABS. < p>Dimensions: 85 x 85 x 28 mm. Sensor: integrated. Colour: white. Backlight: blue or orange. Operating voltage: 2 x 1.5V AA batteries (not included). Power consumption: &lt;150 uW. Temperature control range: 5 ~99 (factory setting is 5~35). Temperature range: 5~99. Temperature control accuracy: 1. Contents: 1 thermostat. 2 mounting screws. < p>1 instruction manual in English.