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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 Huawei U8800 SmartPhones.

 

Pin
Number		 Pin
Name		 Description
1 Tip Speaker 1 +
2 Ring1 Speaker 2 +
3 Ring2 Microphone + / Answer Button +
4 Sleeve Ground

 

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Huawei U8800 SmartPhones headset visual pinout:click to enlarge
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