Williams AV IR SY2 Small-Area Infrared SystemSmall area infrared system ideal for use as a small area assistive listening system or for private TV listening in small conference rooms, hospital rooms, assisted living facilities, medical treatment centers and or jury deliberation rooms. High efficiency LEDs display power status and audio input. Power with A C power supply or standard USB port on a TV. Plug and play install with 3. 5MM audio input. One or two channel operation (2. 3 and 2. 8 Mhz).