The Mains Switch RF Solution Wireless Pump Overrun Switch by Mainsswitch is a programmable thermostat, allowing remote thermostat connection. It can be used for any electrical requirement where you need to wirelessly mirror a switched live signal. Lighting Control: You can use them to switch on lights in remote locations, such as a garden shed or outbuilding, without running new underground cables. Ventilation & Fans: They are ideal for triggering extractor fans wirelessly when a remote appliance or light is turned on. General Switched Live Replacement: They can replace any standard switched live cable run, making them useful during extensions or renovations where lifting floorboards is difficult. Heating System Valves: Plumbers often use them to send switch-live signals back from two-port valves to a wiring centre or boiler in retrofit installations.