The audio adapter is designed for the Motorola Droid Ultra:

• Motorola Droid Ultra

If you prefer to use a 2.5mm headset with your Motorola Droid Ultra 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 Motorola Droid Ultra phone.

• Easily installs; simply plug the audio adapter into your Motorola Droid Ultra cell phone audio jack; then plug in any 2.5mm, two ring headset into the audio adapter