Completely-in-the-canal hearing aid which fits completely in the canal.

In-the-canal custom hearing aid which only fills about the lower 1/4 of the outer ear.

An in-the-ear custom hearing aid which only fills half the bowl of the outer ear.

In-the-ear custom hearing aid, also called a Full Shell size which fills the entire bowl of the outer ear.

Usually quite discreet, these are small Behind-the-ear type devices, with a much finer clear tube that runs down into the ear canal. Inside the ear canal, there is a small soft silicone dome or a molded, highly vented acrylic tip that holds the tube in place. These devices are designed to reduce the "occlusion effect", which is the amplification of your own voice when your ears are plugged up (try sticking your fingers in your ears and talking). Conversely they increase the possibility of feedback, and as such are limited to moderate high frequency losses. Open-fit devices are very beneficial for High-Frequency hearing losses,

Behind-the-ear hearing aid. The hearing sets behind and over the ear. An earmold is placed into the ear canal with tubing connecting the two pieces.

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