The microphones and amplifiers of behind-the-ear hearing aids fit comfortably in a small case that tucks behind the ear. The amplifier is connected to the ear by a sound tube that is fairly difficult for other people to see. The tube is sometimes connected to a custom-made ear mold. For less severe hearing losses, there are behind-the-ear aids available that connect to the ear with a virtually invisible sound tube that doesn't require an ear mold. Behind-the-ear hearing aids are available with conventional, programmable, and digital technology. A difference in the technology can make a huge difference in the performance of the hearing aids.
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