Clipping earphones

A clipping earphone, comprising:

• a sound-production portion configured to be disposed within a concha cavity of a wearer and in contact with an inner wall of the concha cavity, the sound-production portion including:
• a shell, the shell forming an accommodation cavity;
• a sound productor accommodated in the accommodation cavity;
• and
• a sound outlet hole disposed on the shell and being configured to export a sound generated by the sound productor, the sound outlet hole being in acoustic communication with a front cavity of the sound productor;
• an abutting portion configured to abut behind an ear of the wearer;
• and
• an ear hook configured to bypass an antihelix and a helix of the wearer and connect the sound-production portion and the abutting portion, and the ear hook has a first symmetry plane, wherein
• the shell has a feature point that is in contact with or closest to the abutting portion, a projection of the feature point on the first symmetry plane forms a first projection point, the clipping earphone further comprises a pressure relief hole, the pressure relief hole is in acoustic communication with a rear cavity of the sound productor, the pressure relief hole exports a sound from the rear cavity to the outside of the shell, an arcuate length between a projection point of a center of the pressure relief hole on the first symmetry plane and the first projection point is in a range of 7.5 mm to 9.5 mm.