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4 pin 3.5mm (2.5mm) plug connector layout
4 pin 3.5mm (2.5mm) plug connector
Wiring for the 2.5mm 4-pole headset socket as on the SonyEricsson P800/P900/P910i cell phones.
Pin Pin
Name		 Description
1 Tip Speaker 1 +
2 Ring 1 Speaker 2 +
3 Ring 2 Microphone + / Answer Button +
4 Sleeve Ground

The Answer button is connected to pin 3 and to the Ground.

 
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Pinouts.ru > Headsets, Headphones, Handsfree - pinouts of mobile phones and other equipment  > Pinout of SonyEricsson P800/P900/P910i headset / handsfree connector and layout of 4 pin 3.5mm (2.5mm) plug connector
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