The audio adapter is manufactured for the Qualcomm QCP-860, QCP-1960 and QCP-2760 cellular phones.
For any of the Qualcomm models listed above, before you use a standard hands free headset with your cell phone, you will need to plug in the 2.5mm audio adapter in order for the headset to work. In order to use, plug the audio adapter into your Qualcomm cell phone audio jack and then the headset plugs into the adapter; for use with any 2.5mm, two ring audio headset
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