The DANFOSS TP5000 Si Wireless 5/2 Day Programmable Room Thermostat is a digital control system designed for central heating radiators. It features a white rectangular shape and is powered by AA batteries. The thermostat offers programmability for both 5-day and 2-day schedules, with auto system switching for added convenience. Ideal for surface-mounted installation, this Danfoss product utilizes temperature sensor technology for precise control and is compatible with other Danfoss RX1, RX2 and RX3 systems. Finally updating my heating system. These thermostats are now redundant but were working well when pulled.