The GTL II is precisely machined out of aluminum and is hard anodized with a non-reflective surface. The external design of the GTL II closely follows the clean simplicity of the GLOCK pistol. Compatibility: Fits standard frame GLOCK pistols with GLOCK rail. Does not fit slimline models. Performance: ~ 600 Lumens for bright illumination ~ 11,100 Candela for light concentration Controls: Choose from temporary, constant, and strobe settings. Includes two interchangeable light control switches for preferred use Package Includes: GLOCK Tactical Light II Interchangeable ambidextrous controls Disassembly tool Instruction manual/warranty card CR123A battery* *Battery: Self-regulating feature to save battery life Removable lens head for easy battery replacement.