QSC K.2 LOC 
This clever device prevents anyone from tampering with the settings on your K.2 Series loudspeaker at gigs. When placed rear panel of speaker, Lock Out Cover protects speaker's LCD menu, selector knob and buttons, as well all three gain settings. Four recessed screws ensure stays securely in place, giving you peace mind when can't keep an eye speakerwhether before, during or after a gig. Not only is great for mobile performers, such wedding DJs, it's also ideal installed sound systems where equipment may unsupervised, yet still be easily accessible to public.