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4 pin 3.5mm (2.5mm) plug connector layout
4 pin 3.5mm (2.5mm) plug connector
at the headset cable
4 conductor diagram
The pinout should fit 8 devices/models. Click to list>
Pin Pin
Name		 Description
1 Left audio channel (tip)
2 Right audio channel (1st ring)
3 Microphone input channel (2nd ring)
4 Ground Common ground

If 3-pin 2.5 mm standard headphone headset detected, the pinout is following: pin 1 (tip) - mic, pin 2 - earbud, pin 3 - ground.

 
Pinout status: +3 -1
According to 6 reports in our database (3 positive and 1 negative) the PalmOne Treo 650, 700, 755p and Centro headset / handsfree diagram pinout should be correct.

Is this pinout
NO DIY devices
PalmOne Treo 650, 700, 755p and Centro headset / handsfree diagram visual pinout:click to enlarge
Source(s) of this and additional information: Palm Developer Guide, Palm OS Platform, Software and Hardware, Rev. G
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