Take the TI 410 as a replacement transmitter for the IS 410. The IS 410 TV is an ultra-lightweight infra-red stereo stethoset headphones system, enabling the user to individually adapt the volume of TV sets, radios and hi-fi systems to his or her hearing preference.The transmitter is easily connected to this equipment and transmits crystal-clear audio within a room. Operation of the stethoset headphone system is easy and intuitive, with the headphones switching on automatically when they are put on.Balance and volume are set directly on the stethoset headphones while the transmitter features a compression button for further enhancing speech intelligibility.