The audio adapter is designed for the Sonim Enduro XP4400:
Sonim Enduro XP4400
If you prefer to use a 2.5mm headset with your Sonim Enduro XP4400 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 Sonim Enduro XP4400 phone.
Easily installs; simply plug the audio adapter into your Sonim Enduro XP4400 cell phone audio jack; then plug in any 2.5mm, two ring headset into the audio adapter
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Original Sonim Enduro XP4400 Hands Free 2.5 Audio Adapter