Electrified inlets Provide you with a simple one-step operation to plug in a Current-Carrying hose, eliminating the need to plug an additional cord into an electrical outlet to power an electric brush;System turns on automatically when an un-switched hose is inserted or is ready for immediate activation when inserting a switched hose which means you can begin vacuuming right away;Requires CI399RK rough-in kit for Proper installation; UL apProved for your confidence; use with NuTone CH615 central cleaning system hoses