Assistive listening device (ALD's)
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An Assistive listening device (ALD) is used to provide hearing ability for people in a variety of situations. A common usage is to aid people who are hard of hearing. The ALD may be used to help people hear televisions and other audio devices and also to help people hear speech through public address (PA) systems such as in church, lecture hall, theatre or other venue.

The assistive listening device is usually used as a system where the audio source is broadcast wirelessly. The person who is listening may be required to use a receiver to receive the cordless signal and allow them to adjust volume and in some cases tone and listen at their preferred levels.

An Assistive listening device in a broader interpretation may include Alerting Devices (visual, audible and tactile) as well as an increasing range of products for personal, domestic and non-domestic applications.