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4 pin 3.5mm (2.5mm) plug connector layout
4 pin 3.5mm (2.5mm) plug connector
at the headset cable


 

Pin
Number		 Pin
Name		 Description
1 Tip  Left Audio
2 Ring1  Right Audio
3 Ring2  Mic / pushbutton
4 Sleeve  Ground

Resistance between ring2 and sleeve, when pushbutton is ...

... pressed: 280 ohm

... not pressed: 2.2k ohm

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