| Pin Number  | 
            Pin Name  | 
            Description (may be empty) | 
| 1 | M+/ADC | Microphone + / Connect - Disconnect Button | 
| 2 | SP+ | Speaker(s) | 
| 3 | SP- | Speaker(s) Common and system ground | 
| 4 | M- | Microphone - | 
 
| Pin Number  | 
            Pin Name  | 
            Description (may be empty) | 
| 1 | M+/ADC | Microphone + / Connect - Disconnect Button | 
| 2 | SP+ | Speaker(s) | 
| 3 | SP- | Speaker(s) Common and system ground | 
| 4 | M- | Microphone - |