The Streamlight Weaponlight is ultra lightweight and compact. There is C4LED technology. It securely fits a broad range of weapons. There is an ambidextrous momentary/steady on-off switch.C4 LED delivers 4,100 candela peak beam intensity; 125 lumens. 2-3 times brighter than high-flux LEDs.Parabolic reflector produces a concentrated beam with optimum peripheral illumination.Optimized electronics provide regulated intensity.Includes 6 interchangeable keys to fit a wide variety of weaponsRail clamp designed to rapidly attach/detach from side of weapon. One handed snap-on and tighten interface keeps hands away from muzzle when attaching/detaching