The Streamlight TLR-1 HPL Long Range Rail Mounted flashlight provides extreme brightness and remarkable durability. It securely fits a broad range of weapons without the inconvenience of using tools or the danger involved in putting your hands in front of the muzzle. With a 48,000 candela beam intensity and 1000 lumen output, this light produces a far-reaching 438 meter beam with optimal 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. This mounted flashlight runs on two 3V CR123 lithium batteries, which are included.