Infrared Listening System, Excellent Sound Reproduction with Adjustable Volume & Tone. Enables the user to listen more clearly to their television, radio etc. at their chosen volume without disturbing others. Offers unrivalled connectivity (direct, audio, USB, microphone). This 2-part system consists of a mains powered transmitter and a receiver powered by a rechargeable battery. Two versions are available, with a choice of a Headset Receiver that feeds sound directly to the ears, or a Neckloop Receiver which is suitable for use by a hearing aid user (T setting). The transmitter picks up the sound from the television and sends it to the receiver via an invisible infrared beam. Place the transmitter on top or underneath the TV. As this system transmits via infrared, the receiver must always be in the 'line of sight' of the transmitter i.e. the same way a remote control works with your TV. To recharge, simply place into charging cradle, normally lasts around 6 hours before recharging required.