The headset is lightweight and comfortable and has volume control. The headset converts the infrared energy back to amplified sound. These systems are commonly used by the hearing impaired in theaters and churches. Some loops are connected to standard public address systems. The electric current flowing through the loop creates a magnetic field that can be picked up by a hearing aid set on the T-switch.
Portable receivers are available for hearing impaired people without a hearing aid T-switch.
To pick up the signals, hearing impaired listeners must sit within or near the loop. They work by sound being picked up by a battery operated microphone at the source and transmitted via a tiny wireless FM radio directly to earphones worn by the hearing impaired person. This method delivers high quality sound and reduces interference caused by background noise. It is suitable for hearing a person speaking, TV and radio. Since the transmission can occur over a 300 foot range, it is also ideal for large group gatherings.