Palm Treo 680 pinouts
The connector/pinout information may be applied to the Palm model Treo 680
Universal Cell Phone 3-pole (mono) headset connector pinout cordless/cell phones headset/handsfree cable connector
PalmOne Treo 650, 700, 755p and Centro headset / handsfree diagram pinout 4 conductor diagram
MRLG 4-pole 2.5mm headset connector pinout MRLG pinout