The ME83 gas boiler thermostat is with LCD digital display screen. It is with 1.5V two sections of AA batteries. It is used to control boilers to start or stop working in order to adjust temperature. Thermostat detects room temperature, when actual room temperature is lower than your set temperature, thermostat controls boiler to start working. Then thermostat controls boiler to stop working when actual room temperature is higher than your set temperature.Product Features1) Convenient to mount on the wall or stand on somewhere.2) AA battery powered, can put anywhere that you want.3) Can set 5+2 weekly programmable.4) Children lock to avoid misoperation.5) Anti-freeze function.Product Specifications100% New conditionWorking voltage: 2 x 1.5V AA battery (not included)Power consumption: 150uWTemperature control range: 5~99, (factory setting is 5~35) Temperature limit range: 5~99Temperature control accuracy: 1Size: 85 x 85 x 28mmTemperature sensor: In-builtPackage Includes:1 x gas boiler thermostat2 x mounting screws1 x English instruction