A hearing aid, which consists of a microphone, amplifier, and speaker, makes sound louder for the user.

A hearing aid is a small electronic or digital medical device designed to help people who are hard of hearing. It makes sound louder for the user.

A hearing aid basically consists of three parts- a microphone, amplifier, and speaker. The microphone collects the sounds from the user’s environment and converts the sound waves into electrical (or digital) signals. The amplifier magnifies the power of the signals and then sends them to the inner ear through a speaker.

Those with a hearing disability have damaged hair cells in the inner ear. The surviving hair cells detect the sound vibrations magnified by the hearing aid and transmit them to the brain. However, if the hair cells are too damaged, then a hearing aid may be ineffective.

Hearing aids are available in various styles. The most common ones known as behind-the-ear (BTE) aids, consist of plastic cases worn behind the ear, which contain the electronic parts. The cases are connected with a narrow tube to the earmold which is inserted inside the ear. Smaller hearing aids in the form of earmolds that fit in snugly inside the ear are almost invisible to others like in-the-ear (ITE), in-the-canal (ITC) and completely-in-canal (CIC) aids.

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