Harvard Health Letter

A better hearing aid?

Open-fit models don't block the ear canal, so some people find them more comfortable.

Hearing aids come in all shapes and sizes, and their insides have gone digital and amazingly diminutive, like so many other gadgets these days. But for all the technological pizzazz, hearing aids today have the same three basic parts as yesterday's models: a microphone that captures sound, a processor that amplifies it, and a tiny speaker. (The speaker is sometimes referred to as the receiver, a confusing bit of jargon.)

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