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With a loop system, one person uses a microphone and it is transmitted straight into the hearing aid. This allows for the person wearing the hearing aid to shutout the noise that is not important around them.

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The FM system uses radio waves to send signals to the hearing aid to insert specific sound straight into the hearing aid.

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With a typical door bell those who are deaf are not able to use it. With a flashing doorbell they are able to see that someone is at the door as well as which door they are at.

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For those who are hard of hearing but not sever hearing loss, hearing aids work to amplify the sound in the world around them. This allows the person using the hearing aid to more clearly hear things that they otherwise have difficulty with.

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Cochlear implants has had the most success partially restoring hearing to those who have sever hearing loss. By bypassing the outer ear all together, those who have sever hearing loss don't have to rely on the part of there ear that is injured.