All hearing aids consist of the same major components.
The components of a hearing aid are held together in a protective case often made of plastic.
The first major component of a hearing aid is the microphone, which picks up sounds from the air and converts them into electrical signals.
The amplifier increases the intensity of the signals from the microphone. Filters modify the sounds, so that only sounds relevant for the user are amplified.
The third basic component of a hearing aid is the 'loudspeaker' (receiver). It converts electrical signals into the acoustic signals heard by the user.
In addition to these three common components of a hearing aid, digital hearing aids include a small computer programmed to manipulate the signals to fit the hearing loss of the individual user.
Some hearing aids are equipped with special control functions for individual adjustments.
Many hearing aids offer remote control, facilitating adjustments, particularly for users with dexterity problems.
The special batteries required by all hearing aids come in many sizes and with varying capacities. A standard battery lasts between 5 and 14 days, depending on the type of hearing aid, capacity, type of battery and how much the hearing aid is used.
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