The audio adapter is designed for the LG Spirit 4G:
LG Spirit 4G
If you prefer to use a 2.5mm headset with your LG Spirit 4G 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 LG Spirit 4G phone.
Easily installs; simply plug the audio adapter into your LG Spirit 4G cell phone audio jack; then plug in any 2.5mm, two ring headset into the audio adapter
Currently offered on: Metro
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Original LG Spirit 4G Hands Free 2.5 Audio Adapter