JANE SHEMILT / SCIENCE PHOTO LIBRARY JANE SHEMILT / SCIENCE PHOTO LIBRARY
High loss helix hearing aid. Close-up of a high loss helix hearing aid. This hearing aid fits into the rim of the outer ear. The small dial controls the volume of incoming sound. The plastic flap is the lid of the battery case. Hearing aids improve hearing in people with partial deafness. Sound is picked up by a tiny microphone, amplified, and then transmitted into the ear by a tiny speaker. Each hearing aid is fine-tuned to amplify the range of frequencies most needed by the patient. This aid is designed to amplify high-frequency sounds the most.
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