An Assistive Listening Device is not a hearing aid but a device designed to improve the ability of a person with HI to communicate and to function more fully. Assistive listening devices are of two types:
1. Devices that transmit the amplified sound more directly from its source to the listener
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FM systems
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Infra red systems
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Loop induction system
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Telephone amplifiers
2. Devices that transform sound into a visual or tactile signal.
