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A hearing aid is a small electronic device that you wear in or behind your ear.  Hearing aids work by collecting sounds from the environment through microphones, processing the sounds to help separate what you want to hear, from the background noise, and then directing this processed signal into your ear, using a speaker.  Hearing aids come in three basic styles, those that fit behind the ear, those that fit inside the outer ear, and those that fit within the ear canal.  The hearing aid that will work best for you depends on the type, and severity of your hearing loss.  You and your doctor or hearing professional should select a hearing aid that best suits your needs and lifestyle.