If you do not wear a hearing aid, a special receiver is provided. Users need to sit within the loop area in order to pick up the transmissions. Interference from fluorescent lights can be a problem with induction loops, causing sound quality to be uneven. The user controls the volume. Induction loops are good for people with hearing aids with a t-coil, because no additional equipment is necessary.
Infrared systems carry the sound from a transmitter to the user's receiver.
Infrared transmission is the only form of ALD that offers any kind of confidentiality. Interference from fluorescent and incandescent lights is a possibility in a well lit room. A dog can also be great at letting you know when someone is at the door. Special 'shake- awake' alarm clocks which vibrate a pad beneath your pillow to wake you. A baby alarm which works in a similar way, or flashes a light when your baby is crying, is also handy for parents.