Specification: Model:ME83B The ME83B 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. Feature: 1 Convenient to mount on the wall or stand on somewhere. 2 Wireless, AA battery powered, can put anywhere that you want. 3 Can set 5+2 weekly programmable. 4 Children lock to avoid misoperation. Working voltage: 2 x 1.5V AA Battery not included. Wall Mount Electronic Programmable LCD Screen Digital Heating Thermostats Home. The ME83B gas boiler thermostat is with LCD digital display screen. 1 Convenient to mount on the wall or stand on somewhere. Working voltage: 2 x 1.5V AA Battery (not included). Size: 85 x 85 x 28mm. Attention: water heating thermostat doesn't outer sensor. 1 x User Manual (English). For all orders, please note that. 1 or 2 Star DSR Ratings Destroy Our Company. We will be happy to serve you. OUR WORKING Time(Beijing): 9:00am6:00pm(MondayFriday).