The audio adapter is designed for the Samsung Convoy 3:
Samsung Convoy 3
If you prefer to use a 2.5mm headset with your Samsung Convoy 3 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. This adapter allows you to use a 2.5 headset with your Samsung Convoy 3 phone.
Easily installs; simply plug the audio adapter into your Samsung Convoy 3 cell phone audio jack; then plug in any 2.5mm, two ring headset into the audio adapter
Currently offered on: Verizon
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Original Samsung Convoy 3 Hands Free 2.5 Audio Adapter