TRITTON Kunai Universal Stereo Gaming Headset - Manual (Page 6)

[6]
In-line Controls
Game Audio Volume: Use
to adjust the volume of the
game audio .
Voice Communication Volume:
Use to adjust the volume of the
voices of other players .
Xbox LIVE Communication
Cable Port Mic Mute: Slide the mic mute switch
so that others cannot hear you . The
orange area behind the switch will
show when the mic is muted .