Compatible with most rail-equipped handguns, the Nightstick® Xtreme Lumens Tactical Weapon-Mounted Light delivers an impressive 850-lumen maximum output with a high-efficiency, deep parabolic reflector for a reliable 245-meter beam range. Fully ambidextrous toggle switches on each side of the light readily accommodate both right- and left-handed shooters, while momentary-on and constant-on lighting modes keep you in complete control for superior light discipline. The Type III hard-coat anodized 6061-T6 aircraft aluminum housing, coupled with a glass-filled nylon polymer battery door and toggle switches, ensures lasting durability and shock resistance for reliable performance when it matters most. Operates on two CR123 batteries (included). IPX7 waterproof.