Alienware AW988 - Turning headset on and off; Adjusting the master volume

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Turning on/off your headset
Press the power button on the left earcup to turn the headset on. Press and hold
the power button for 3 seconds to turn the headset o.
Adjusting the master volume
Use the Master volume control to adjust the speaker volume. Turn the control up
to increase the volume, or down to decrease the volume.