The ESI Wireless Programmable Room Thermostat ESRTP4RF+ is a white digital thermostat that works on a battery power source and is wireless for easy installation. It is compatible with central heating boilers and comes with a receiver for seamless operation. The thermostat offers programmable days ranging from 24-hour to 7-day, along with various other features for efficient heating management. With a manufacturer warranty of 3 years, this ESI Controls product is a reliable option for maintaining a comfortable home environment.