Headphone structure for adjusting audio frequencies

A headphone structure for adjusting audio frequencies, comprising a front housing, a rear housing, a sound-producing unit in the front housing and an elastic ear-contacting body sleeving the front housing, the headphone is an in-ear headphone, the elastic ear-contacting body is an elastic plug, characterized in that the front housing is provided with at least one slot or recess, and the elastic plug sleeves the front housing to form at least one gap;

• the elastic plug is provided with a base ring, the base ring is provided with a concave-convex structure at the bottom thereof, the front housing is provided with a concave-convex step for engaging with and abutting against the concave-convex structure of the base ring, the concave-convex step is provided with a concave-convex step, by adjusting a fluctuation degree of the concave-convex portion of the concave-convex step, the size of the gap can be adjusted.