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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
should work with Moto Defy, Moto Droid and some others(3.5mm)

 

Pin
Number		 Pin
Name		 Description (may be empty)
1 L_SPKR  Left audio speaker
2 R_SPKR  Right audio speaker
3 GND-  Common ground / Mic-
4 MIC+  Mic +/ Button shorts to GND

Left and Right are red\green(pin 1 and 2)

Their ground(gold) goes to 3

MIC's dual-color cable(red+green) goes to 3

And it's gold cable goes to 4

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PinoutsGuide.com > Headsets, Headphones, Handsfree - pinouts of mobile phones and other equipment  > Pinout of Motorola Defy headset / handsfree
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