The TLR-9 includes customized ambidextrous on/off rear switch in either a Low or High option to match your Shooting style. It features a rail clamp that is designed to rapidly attach/detach from full frame weapons. 6000 Series machined aircraft aluminum with black anodized finish, "Safe off" feature on bezel - unscrew until you feel it "stop" - prevents accidental activation, saves batteries. Powered by two CR123A lithium batteries included.