A Hearing Aids is an electroacoustic device which typically fits in or behind the wearer's ear, and is designed to amplify and modulate sound for the wearer. Earlier devices, known as an "ear trumpet" or "ear horn", were passive funnel-like amplification cones designed to gather sound energy and direct it into the ear canal. Similar devices include the bone anchored hearing aid, and cochlear implant.
There are many types of hearing aids (also known as hearing instruments), which vary in size, power and circuitry. Among the different sizes and models are:
- Body worn aids;
- Behind the ear aids (BTE);
- In the ear aids (ITE);
- Receiver In the Canal/Ear (CRT/RIC/RITE);
- In the canal (ITC), mini canal (MIC) and completely in the canal aids (CIC);
- Invisible In canal hearing aids (IIC);
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