BEAMSHOT BS1000S/B-M1 Super Bright Red LasersightBattery and M1 Rail Mount - Included!) 5 Times brighter than standard sights Battery and M1 Rail Mount included (Valued USD40) Affording your superior grip and compatibility synonymous with Beamshot Wavelength/Range 650nm (645 665nm)/500 yards; Dot Size 1/2"@10 Yards, 4"@100 Yards; Windage & Elevation adjustment: 3 ft.;@10 yards, 30 ft.;@100 yards Powered by 1 CR123A Battery; Operation: 5" cable pressure activation switch; (Option Accessory: ST1 On/Off Switch) Requires no alteration to your weapon that could void its manufacturer's warranty; Up to 20 hours continuous use (constant on). Most popular since 1992. Sold more than 100,000 units