Earphone

An earphone, comprising:

• a sound production component including:
• a transducer including a diaphragm;
• and
• a housing, the housing forming a cavity configured to accommodate the transducer;
• and
• an ear hook, wherein in a wearing state, the ear hook is configured to place the sound production component at a position near but not blocking an ear canal, wherein
• an inner side surface of the housing facing an auricle of a user is provided with a sound outlet that is configured to transmit a sound generated at a front side of the diaphragm to the ear canal,
• at least another side surface of the housing is provided with a first pressure relief hole that is configured to guide a sound generated at a rear side of the diaphragm out of the housing, and
• a distance between a center of the sound outlet and a midpoint of an upper boundary of the inner side surface is greater than a distance between a center of the first pressure relief hole and the midpoint of the upper boundary of the inner side surface,
• the sound production component has a connection end connected to the ear hook and a free end not connected to the ear hook, and
• in the wearing state, the free end extends into a concha cavity of the user, there is a specific distance between the inner side surface of the housing and an inner wall of the concha cavity, the inner side surface of the housing and the inner wall of the concha cavity form an auxiliary cavity, and the sound outlet is at least partially located in the auxiliary cavity.