Beamshot NightStalker Invisible IR Laser Sight, Black Glass optics - enables the laser dot to remain tight for pinpoint accuracy Powered by 1 CR123A Battery(Included). Worked with Night Vision Device for 500 meters range Safety On/Off switch - contains an LED indicator that will glow red when the IR laser is on True Windage & Elevation - rapidly sight in the laser to your scope or iron sights. This will enable you to accurately aim using your night vision goggles or night vision scope. Equipped with a universal mount (M1, MIL-STD-1913) that allows it to be attached to any picatinny rail system. Package content of a set (*Valued USD$70): (1) Beamshot M1 Weaver Mount for standard 7/8" weaver base and Picatinny 191 base.; (2) Beamshot RF4 Barrel Mount for 1" Scope and rail round barrel type firearms by silicon rubber spacer.