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4 pin 3.5mm (2.5mm) plug connector layout
4 pin 3.5mm (2.5mm) plug connector

Plug 

Pin Signal Description
1 (Tip) Left ear  White
2 (Ring 1) Right ear  Red
3 (Ring 2) Mic/Switch 1 (Answer Call)  Blue
4 (Sleeve) Ground  Copper
not drawn (Outer Sleeve Ring) Switch 2 (End Call)   
According to 2 reports in our database (2 positive and 0 negative) the O2 Xda II , QTEK 2020, SPV M1000, Dopod 696 (all Himalaya) headphone / headset / handsfree pinout should be correct.

Is this pinout
O2 Xda II , QTEK 2020, SPV M1000, Dopod 696 (all Himalaya) headphone / headset / handsfree visual pinout:click to enlarge
Source(s) of this and additional information: wiki.xda-developers.com
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