EARPHONE

摘要

The present invention relates to an earphone. More particularly, in an earphone having an insertion part which is inserted into external auditory meatus, the insertion part includes a body part, which is extended in a longitudinal direction and includes a preset circuit device and a voice output device, and a shell which surrounds the outer edge of the body part and touches the external auditory meatus. The outer diameter of the insertion part can be partly changed.