Surefire

"The Z68 tailcap switch provides both momentary-on and constant-on activation — press for momentary Scout Light or flashlight activation, press further to ""click"" the light into constant-on mode, click again for off. The raised guard around the push-button is a first line of defense against accidental light activation during operations or (for flashlights) while carrying the light in a pocket or holster. A lock-out feature positively prevents activation during tactical operations, transportation, or storage. Made from aerospace aluminum and Mil-Spec hard-anodized for supreme durability, the Z68 is available in Black or Desert Tan."