Patent ID: 8358800

Claim:
An earphone comprising: two earbuds; a plug assembly; and a wire connected to the earbuds and the plug assembly; the plug assembly comprising: a first insulation shell; a second insulation shell; an adjusting wheel located between the first insulation shell and the second insulation shell; a plug comprising a plug core and a sleeve, the plug core comprising a fixed end fixed to the first insulation shell and a free end protruding out of the second insulation shell, the sleeve comprising two semi-cylindrical canisters arranged around the plug core, the two semi-cylindrical canisters being movable in a radial direction of the plug core; two stopping blocks pivotally mounted to one side of the first insulation shell away from the wire, each one of the two stopping blocks being rotatable between a first position where the one of the two stopping blocks abuts against one of the two semi-cylindrical canisters, causing the two semi-cylindrical canisters to abut against the plug core, and a second position where the one of the two stopping blocks disengage from the one of the two semi-cylindrical canisters; and a resetting element received in the second insulation shell and configured to cause the two semi-cylindrical canisters to be spaced apart from the plug core when the two stopping blocks disengage from the two semi-cylindrical canisters; wherein, the adjusting wheel is operable to rotate relative to the plug by an exterior force to drive the stopping blocks to rotate to the second position, enabling an external diameter of the sleeve to change from a first value to a second value greater than the first value.