Simple two minute installation: Just plug the receiver"s power supply into an AC wall outlet in one room. Insert two AAA alakline batteries in the transmitter, and place it in another room, and you"re done. * Battery operated transmitter, and external plug-in power supply for the receiver, for compactness. * Expandable design allows multiple transmitters and receivers throughout your home * Great for VCR"s, Satellite Receivers, DVD players, and more. Now you only need one video source and you can control it from other rooms. * The infrared extender cable lets you place the receiver behind closed doors of an A/V cabinet