The invention discloses an earphone used in an ear. The earphone comprises an earphone body, a plug, a drive-by-wire device and a loudspeaker, wherein the drive-by-wire device comprises a call putting-through button, a switching button which can axially move, an all-direction microphone and a circuit control module, and the circuit control module comprises a switching control module and a microphone noise-reducing module; the switching control module comprises a switching switch with six connecting points; the first connecting point, the second connecting point and the third connecting point are respectively opposite to the sixth connecting point, the fifth connecting point and the fourth connecting point; the first connecting point and the fourth connecting point are connected to a GND point of the plug; the sixth connecting point and the third connecting point are connected to an M+ point of the plug; the second connecting point and the fifth connecting point are respectively connected to the anode and the cathode of the microphone; when the switching button is located at a first position, the first connecting point, the second connecting point, the sixth connecting point and the fifth connecting point are conducted; when the switching button axially moves to a second position, the second connecting point, the third connecting point, the fifth connecting point and the fourth connecting point are conducted. The earphone has the beneficial effects that the earphone can be compatible with an iphone and other phones, and the noise of the microphone can be effectively eliminated.