The IS 410 is an ultra-lightweight infrared stereo stethoset TV listening system, that enables the user to individually adapt the volume of TV sets, radios and hi-fi systems to his or her hearing ability. The transmitter connects easily to this equipment and transmits crystal clear audio within a room. Operation of the stethoset headphone system is easy and intuitive. Balance and volume are set directly on the stethoset headphones. The transmitter features a compression button, that further enhances speech intelligibility. Automatic on/off.