This Reliance Furnace Generator Transfer Switch connects a hardwired furnace to a portable generator. Can be used on any 15 Amp 120V forced-air furnace circuit. Simply plug a standard grounded extension cord into a power outlet on your generator and into the built-in plug on the transfer switch. Indicator light illuminates area around switch during power outage. Indoor surface mount. UL listed. 5-year limited warranty. U.S.A.