HTC ExtUSB Pinout:
| Pin Number |
Pin Name |
Description |
| 1 | USB VCC +5v | |
| 2 | USB Data - | |
| 3 | USB Data + | |
| 4 | N / C | |
| 5 | USB GND | |
| 6 | Left Audio + | |
| 7 | Sense | Labeled AG on headset board |
| 8 | Audio - (GND) | Labeled CK on headset board |
| 9 | Switch (Talk) | Labeled OT on headset board |
| 10 | Right Audio + | |
| 11 | Mic + | |
| 12 | Chassis Ground (GND) |

