Features the T6 xenon lamp powered by two 3-volt lithium batteries (included) and delivers up to 65 Lumens light output. The bulb and reflector assembly has a factory preset spot and the aluminum reflector is specially coated for optimum light reflection. A pressure sensitive on/off switch is located at the end of an expandable curly cord for convenient placement on the firearm allowing for light activation without moving your grip. Velcro tape is supplied for switch attachment. Two precision machined mounts are included that fit firearms from .22 caliber to 12 gauge. The larger diameter mount also fits extended magazines and scopes. Made from 6061 T6 aircraft aluminum, the T6 is shock resistant under recoil, water resistant with O ring seals and corrosion resistant with a quality black anodized finish.Weapons Light System 2000 (includes mounting brackets and batteries)Specifications: 4.5 length, 1 body diameter,1.25 Reflector Dia., 6 ounces weight (with Batteries).Requires 2.3 Volt Lithium batteries