BEAMSHOT BS1001U/B Ultra Bright Small Dot Laser Sight, Sniper Laser Sight 635nm laser is two time brighter than the BEAMSHOT BS1000 & most of the other brand laser . Provide ultra bright small dot & 800 yards nighttime range Patent-design alignment system provide instant target acquisition with improved accuracy. Powered by 1 CR123A Battery(Included). Up to 40 hrs continuous use. Wavelength/Range 635nm /800yards(nighttime)Dot Size less than 1.75"@100Yards, 4"@100yards.Windage&Elevation adjustment:3 ft.@10 yards,30 ft.@100 yards Effortless adjustment of windage and evaluation. Water-resistant and shockproof.