The Streamlight TLR-1 LED Rail Mounted flashlight provides extreme brightness and remarkable durability. It attaches and detaches easily to almost any firearm without the inconvenience of using tools or the danger involved in putting your hands in front of the muzzle. With a 12,000-candela beam intensity and 300-lumen output, this light produces a concentrated beam with phenomenal peripheral illumination that stays constant thanks to a solid-state current regulation. The TLR-1 can be directly mounted to handguns with Glock-style rails and to all MIL-STD-1913 rails and also is compatible with existing light-bearing holsters. This mounted flashlight runs on 2 3-volt CR123 lithium batteries.