Streamlight TLR-1 Tactical Flashlight with CDM Gear BMT Shotgun Mount Easily attach a Streamlight TLR-1 to you Shotgun Powered by two 3-volt CR123 lithium batteries with 10-year storage life LED Rating: Up to 7,000 candela peak beam intensity and up to 135 lumens measured system output. Deep-dish parabolic reflector produces a concentrated beam with optimum peripheral illumination Run Time: 2.5 hours regulated run time. Solid-state current regulation for consistent illumination level. Rail grip clamp system securely attaches/detaches quickly and safely with no tools and without putting your hands in front of muzzle