The main components of a pocket hearing aid are a microphone, amplifier, and battery in a box. A small wire connects the body to the earphone (or a headphone attached to the ear mold).
Basic Structure of Pocket Hearing Aid
From the perspective of the external structure of the box-type hearing aid, it mainly consists of three main parts: the earphone, the lead and the body (take the JINGHAO box-type hearing aid as an example)

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