Your headset may be shipped with the microphone assembly (boom microphone and cable) attached to the left earcup. If your headset is shipped with the microphone assembly packed separately, you can attach it to either earcup.
To reattach or relocate the boom microphone and cable assembly, follow these steps:
if relocating the boom microphone, use a phillips screwdriver to loosen the two screws on the access cover at the bottom of the earcup, and remove the cover to reveal the connector socket. take care not to lose the screws as they can fall out of the access cover and cable assemblies
Before attaching the boom microphone, make sure the cable and earcup connectors are clean and free of debris
Slide the connector into the socket until it is fully engaged and the cable assembly is flush with the earcup. Do not apply excessive force; you might damage the earcup
With the screw threads properly aligned, tighten the screws
Rotate the microphone boom into position so it will be near your mouth when you put on the headset. The label should be facing the lips
Attach the access cover to the earcup that does not have the boom mic attached. Align the screws and tighten them to secure the cover
Make sure you try the headset and test its operation before flight