Patent ID: 8837766

Claim:
An ear-loop earphone, comprising: a main body, having a surrounding side, a back side, and a front side, wherein the back side is opposing to the front side, the front side has a plurality of apertures for outputting an audio, and the surrounding side surrounds the front side and the back side; an ear-loop base, fixed on the surrounding side of the main body in a rotatable manner, wherein the ear-loop base rotates with respect to a first axis; and an ear-loop, fixed on the ear-loop base in a rotatable manner, wherein the ear-loop rotates with respect to a second axis different from the first axis; wherein the main body further has a detection device connected to the ear-loop base or the ear-loop, the detection device detects whether the ear-loop or the ear-loop base is rotated, so as to automatically determine the front side of the main body to output the audio of a left or right channel; wherein the detection device has a piezoelectric ceramic and a voltage detector, wherein the piezoelectric ceramic is under stress while the ear-loop or the ear-loop base is rotated, while the piezoelectric ceramic is under stress, the voltage across the piezoelectric ceramic is changes, such that the voltage detector detects the voltage across the piezoelectric ceramic to automatically determine the front side of the main body to output the audio of a left or right channel.