Earphones

An earphone, comprising:

• a sound production component, including a transducer and a housing accommodating the transducer;
• and
• an ear-hook, the ear-hook being configured to place the sound production component at a position adjacent to an ear canal but not blocking the ear canal in a wearing state, wherein,
• the sound production component and an auricle have a first projection and a second projection, respectively, on a sagittal plane,
• a first distance exists between a centroid of the first projection and a highest point of the second projection along a vertical axis direction,
• a ratio of the first distance to a height of the second projection along the vertical axis direction is in a range of 0.35 to 0.6,
• the housing is provided with a sound outlet on an inner side surface facing the auricle for conducting a sound generated by the transducer out of the housing and to the ear canal,
• one or more pressure relief holes are provided on one or more other side surfaces of the housing, and
• a distance between a projection point of a center of at least one pressure relief hole of the one or more pressure relief holes on the sagittal plane and a projection point of a ⅓ point of a lower boundary of the inner side surface on the sagittal plane is in a range of 13.76 mm to 20.64 mm or 8.16 mm to 12.24 mm.