Earphone

An earphone comprising an earphone housing, a speaker cover adapted and connected to the earphone housing, and a speaker received in a cavity defined by the earphone housing and the speaker cover, wherein the earphone further includes a tuning baffle disposed inside the speaker cover and a sound emitting tube disposed outside the speaker cover;

• wherein the speaker cover defines a sound emitting hole configured such that the sound emitting tube is rotatably disposed inside the sound emitting hole and is connected to the tuning baffle through the sound emitting hole;
• wherein said speaker cover further defines, a sound outlet hole and at least two mode slots and the tuning baffle defines a mode protrusion and a tuning hole;
• and
• wherein the tuning baffle is rotatable with respect to the speaker cover by rotating the sound emitting tube disposed inside the sound emitting hole so as to adjust a sound outlet area of the sound outlet hole and wherein the rotation of the tuning baffle causes the mode protrusion to be limited by different mode slots.