A digital hearing aid is an electronic device that amplifies sound and is worn to compensate for poor hearing. A hearing aid is a battery-powered, electronic device that makes listening easier for people with a hearing loss.
A hearing aid consists of a microphone, an amplifier and a receiver. The microphone picks up sounds in your acoustic environment and turns them into electronic signals.
The amplifier selectively amplifies the acoustic electronic signals. The receiver is a very small speaker that changes the electric signals back to sounds and delivers the sound to the ear.