Vortex Optics StrikeFire 2 Red/Green Dot Sight with Cantilever Mount (SF-RG-501) and Free Vortex Lens Pen The Strikefire II Red/Green Dot is a rugged, reliable red dot sight that is at home in a variety of shooting applications. It allows the shooter to operate between two dot colors and ten brightness settings to easily adjust for changing conditions. Fully multi-coated lenses provide a clean and bright, unobscured point of view. Unlimited eye relief allows for rapid target acquisition. The single-piece chasis is compact and lightweight but still delivers shockproof performance withstanding both recoil and impact. Nitrogen purging and o-ring seals ensure fogproof and waterproof performance. An offset cantilever mount is provided; allowing you to move the sight forward to be used in conjunction with a magnifier and backup iron sights all on the same rail. With aesthetics and functionality in mind, the power controls are at the rear of the Strikefire for easy access. The Strikefire II runs off a CR2 battery. Vortex Optics lens pen included.