Williams AV IR T1 Small-Area Infrared TransmitterThe Williams AV IR T1's sleek, compact footprint is ideal as an assistive listening system for small areas or for private TV listening in areas such as small conference rooms, hospital rooms, assisted living facilities, medical treatment centers and jury deliberation rooms. The T1 is so energy efficient it can be powered from a standard USB port on a TV. Provides a coverage area of up to 1300 square feet.