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4 pin 3.5mm (2.5mm) plug connector layout
4 pin 3.5mm (2.5mm) plug connector
at the cable
4 pin USB A or USB B plug connector layout
4 pin USB A or USB B plug connector
at the cable

 

Pin
Number		 Pin
Name		 Description (may be empty)
1 USB DATA - / Left Channel  
2 USB DATA + / Right Channel  
3 Vcc  
4 GND  

 

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