White LED delivers 170 lumens; 3,300 candela peak beam intensity Runs 1.5 continuous hours to the 10% output level Textured parabolic reflector produces a concentrated beam with optimum peripheral illumination; optimized electronics provide regulated intensity Compact - Weighs 2.32 ounces (65.8 grams) with included battery; 2.71 in. (6.88 cm) long Key kit included for mounting to a variety of weapons (H&K USP models do not include key kit) Rail 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 Ambidextrous momentary/steady On-Off switch Uses one 3V CR2 lithium battery (included) Impact-resistant polymer construction with durable anodized aluminum facecap Borofloat high temperature glass lens IPX7 waterproof to 1 meter for 30 minutes Serialized for positive identification Limited lifetime warranty Assembled in USA