Hearing aids are electronic devices that collect sound, amplify it, and direct the amplified sound into the ear. While the style of hearing aid may vary, all hearing aids have similar components:
- A microphone to pick up sound
- An amplifier to make sounds louder
- A receiver (miniature loudspeaker) to deliver the amplified sound into the ear
- Batteries for power
Some hearing aids also have earmolds (or dome ear pieces) to direct the flow of sound into the ear and enhance sound quality.