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4 pin 3.5mm (2.5mm) plug connector layout
4 pin 3.5mm (2.5mm) plug connector
at the audio cable
The newer lenovo laptops like Thinkpad Edge 15, Edge E320 and X121e have only one 3,5mm 4 pin port for earphones and microphone.
Pin
Number		 Pin
Name		 Description
1 L  Left
2 R  Right
3 G  Ground
4 M  Mic

Compatible with a ipad/iphone earphone.

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