The Salus RT300RF RT300 RF RX Receiver Unit is a programmable thermostat designed for central heating radiators. This white, square-shaped receiver unit is wall-mounted and operates on a 7-day programmable schedule. With digital control style and temperature sensor technology, this corded electric unit offers efficient heating management with the ability to switch to heat-off mode. Compatible with Salus brand thermostats, this programmable receiver unit is an essential component for controlling your heating system.