Headsets, Headphones, Handsfree - pinouts of mobile phones and other equipment  > Panasonic pinouts
Pin Pin
Name
Description
1 MIC Mic (+)
2 AUDIO Audio (+)
3 GND MIC (-)
4 GND Audio (-)

I had dificulties finding this pinout for making my own headset from a Nokia cellphone.

4 pin 3.5mm (2.5mm) plug connector layout
4 pin 3.5mm (2.5mm) plug connector
According to 4 reports in our database (4 positive and 0 negative) this pinout should be correct.

Is this pinout
Panasonic KX-T77xx Headset Mono pinout visual pinout:
Panasonic KX-T77xx Headset Mono pinout diagram
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