Patent ID: 8249288

Claim:
An earphone comprising: two headphones; a plug assembly; and a wire connecting to the headphones and the plug assembly; wherein, the plug assembly comprises a main pole, a first plug comprising a head portion and a first tube body connecting to the head portion, set at one end of the main pole and electronically connected to the wire, a sleeve operable to cover the first plug, and an adjusting wheel screwed on the main pole; wherein, a first left channel contact portion, a first right channel contact portion, and a first grounding contact portion are set in the first tube body in turn, and a second left channel contact portion, a second right channel contact portion, and a second grounding contact portion, corresponding to the first left channel contact portion, the first right channel contact portion, and the first grounding contact portion, respectively, are set in the sleeve in turn, and are operable to electronically connect to the first left channel contact portion, the first right channel contact portion, and the first grounding contact portion respectively when the sleeve covers the first tube body; wherein, the adjusting wheel is configured for driving the main pole to move when receiving an exterior force, thereby driving the first plug to extend out of the sleeve or receive into the sleeve.