Picks up sound waves

4. Circuit:
 

Changes the sound waves into an electrical signal and modifies it based
upon computer data provided by the hearing professional. The circuit is
manipulated by sophisticated software to do the following:
Detect feedback and virtually eliminate it (telephone)
Reduce harsh effects of loud sounds (trucks)
Reduce almost all background noise hindering speech perception (party
situations)
Enhances the fine nuances of music (concerts)

5. Receiver:
 

Converts the amplified sound back into an electrical signal to deliver the
sound through the ear canal.

6. Battery:
 

Charges energy particles provide the necessary power to the components
of the hearing aid.

7. Inner Ear