The audio adapter is designed for the HTC One Mini:

• HTC One Mini

If you prefer to use a 2.5mm headset with your HTC One Mini 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 HTC One Mini phone.

• Easily installs; simply plug the audio adapter into your HTC One Mini cell phone audio jack; then plug in any 2.5mm, two ring headset into the audio adapter