Streamlight 69222 TLR-3 Tactical Weapon-Mounted Light for Heckler & Koch USP Full-Size. This lightweight rail-mounted light, constructed of an impact-resistant polymer, is designed to fit compact and sub-compact handguns. It also fits most full-sized handguns with rails on the market. Now shining brighter at 170 lumens! 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.