With a Wireless Remote Outlet Control System, one can turn on/off electrical devices-e.g., lights, radio, TV, heater, fan-from across the room or even in another part of the house using a hand-held remote controller. The signal from the remote travels through walls and other obstacles up to 100 feet away (depending on model). Most systems come with three receivers that plug into electrical outlets, plus the remote. Some are designed for indoor use only, others for both indoor and outdoor.