Designed for use where people live, learn, and work, Spectrum 2500i plugs into electrical outlets and removes electromagnetic interference (EMI), or dirty electricity, from building wiring before it spreads potentially harmful radiation into rooms. Grounded, 3-prong, multi-capacitor design enables direct reduction of EMI traveling along all wires in building, including the ground wire. Built-in outlet at base allows access to electricity while filter is in operation.