A hearing aid is a small electronic device that you wear in or behind your ear. It makes some sounds
louder so that a person with hearing loss can listen, communicate, and participate more fully in daily
activities. A hearing aid can help people hear better in both quiet and noisy situations, and to hear
sounds that they have been missing.
A hearing aid has three basic parts: a microphone, amplifier, and speaker. The hearing aid receives
sound through a microphone, which converts the sound waves to electrical signals and sends them to
an amplifier. The amplifier increases the power of the signals and then sends them to the ear through a
speaker. Most modern hearing aids contain digital technology. Please see “Do all hearing aids work
the same way?” for a discussion on digital versus analog aids.