A hearing aid is an electroacoustic apparatus which typically fits in or behind the wearer's ear, and is designed to amplify and modulate sound for the wearer.
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- Attitudes of Hearing Impaired Children and Their Parents to the Use of Colourful Hearing Aids Study caried out in the UK in the year 2000.
- Wikipedia: Hearing Aid Article from Wikipedia providing information on the various types of hearing aid, the technology involved, who will benefit from them and the costs involved.
- National Institute on Deafness and Other Communication Disorders: Hearing Aids Answers to many frequently asked questions on hearing aids.
- American Speech-Language-Hearing Association: Hearing Aids Provides information about the types of hearing aids and other listening devices available and their likely cost.
- About.com: Implantable Hearing Aids and Devices Provides information about both surgically implanted and non-surgically implanted devices.