The SureFire Z68 tailcap switch offers both momentary and constant activation for Scout Light or flashlight operation - press for momentary operation press further to click the light into constant-on mode and click again to turn it off. The raised guard around the push-button acts as a first line of defense against accidental activation during operations or when carrying the light in a pocket or holster.SureFire Z68 Protective Rear Cap AssemblyMomentary and constant-on activation modesRaised guard prevents accidental light activationLock-out feature for tactical use transportation or storageFits Scout Lights and flashlights with 3/4-inch diameter switchAerospace grade aluminum constructionDurable black finishEssential for tactical professionals and outdoor enthusiasts who need reliable controlled lighting activation with enhanced protection against accidental operation during critical missions or everyday carry.