TRITTON Kunai Stereo Headset for PlayStation-3 and PlayStation-Vita - 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 .
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 .