5.25" overall. Water resistant. Impact resistant. Tailcap switch. Law Enforcement version. LED. Modes: High (600 lumens, 1.5h runtime), Low (15 lumens, 52h runtime). Parabolic reflector. Polycarbonate window. Black Nitrolon body with aluminum bezel. O-ring and gasket sealed. Tailcap switch meets needs of law enforcement-press for momentary-on high, click for constant-on high, and return to off and click again for low. Requires (2) CR123A batteries (included). Clam packed.