| Pin | Signal | Description |
| 1 | USB +5V in | USB 5V supply – in K750 not used |
| 2 | SP_REF | Reference |
| 3 | Mic+/AUXIN_L | Microphone+ / AUX Input – left |
| 4 | Mic-/AUXIN_R | Microphone- / AUX Input – right |
| 5 | DFMS/SP_L | DFMS / headphone speaker – left |
| 6 | DTMS/SP_R | DTMS / headphone speaker – right |
| 7 | VIDEO/STB | Video / strobe |
| 8 | VPPFLASH | Short to pin 9 for handsfree detection |
| 9 | GND | Ground |
| 10 | CTMS / USB DATA+ | CTMS / USB+ (data) – in K750 not used |
| 11 | CFMS / USB DATA- | CFMS / USB- (data) – in K750 not used |
| 12 | Charge In | Battery charging (+5V) – in K750 not used |