Hearing aid

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Behind-the-ear aid
In-the-ear aid

A hearing aid is a small electrical machine which fits in or behind a person's ear. The purpose of a hearing aid is to make sounds louder so the person can hear spoken words and other sounds.

The two most common types of modern hearing aids are behind the ear aids and in the ear aids.

Before hearing aids were invented, people used "ear trumpets" also called ear horns.[1][2]

Different hearing aids.

References[change | change source]

  1. Comparison of Hearing Aids Over the 20th Century. Ear & Hearing. 21(6):625-639, December 2000. Bentler, Ruth A.; Duve, and Monica R.
  2. http://www.hearingcenter.com/Questions/Q_ear-horn.html Ear Horn Q&A. Accessed 6 Dec 2007.

Other websites[change | change source]