The TLR-7 A includes customized ambidextrous on/off rear switch in either a Low or High option to match your Shooting style. It features a rail clamp that is designed to rapidly attaches/detaches quickly and safely with no tools and without putting your hands in front of muzzle. Securely fits a broad range of full-sized and compact guns. Durable, anodized machined aluminum construction and user enabled strobe function. Engineered optic produces a concentrated beam with optimum peripheral illumination. Specifications for Streamlight TLR-7 X USB Multi-Fuel Rail Mounted Tactical Light: Manufacturer: Streamlight Light Output: 500 lumens Battery Type: SL-B9, Lithium Ion Beam Color: White Beam Distance: 140 m Length: 2.58 - in Weight: 2.64 oz Battery Life: 1.5 hours Finish: Anodized Condition: New Gun Type: Pistol Waterproof: IPX7 ft Water Resistance Level: IPX-7 Package Contents: Streamlight TLR-7 X USB Multi-Fuel Rail Mounted Tactical Light