The Drayton RTSI Model 24001 Room Thermostat is a wall-mounted, square-shaped thermostat made of plastic in white colour. It operates on a 3-wire configuration and uses temperature sensor technology. With a control style of dial and a display size of 2.36 inches, this programmable thermostat allows for adjustable thermostat settings and has a system switch for Heat-Off functionality. Designed for use with central heating radiators, this UK-manufactured thermostat is powered by corded electric and operates at a voltage of 240V.