Mono headset

Plug the mono headset into the stereo headset jack on the controller.

Mono headset. Labeled A through D starting from the top.

A ): Earpiece
B ): Microphone
C ): MIC switch
D ): Clip

When you're using the microphone, you should attach the clip to your clothing.
To adjust the microphone level or configure other audio settings, select (Settings) > [Devices] > [Audio Devices].