The audio adapter is designed for the Ericsson:
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If you have any of the above Ericsson models, 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. Just plug this audio adapter into your cell phone to convert the audio. Works with any standard 2.5 mm jack.
Easily installs; simply plug the audio adapter into your Ericsson cell phone audio jack; for use with any 2.5mm, two ring audio deviceOne year warranty