This is a TruGlo Triton 20mm Red-Dot Optic Sight with High and Low Base. 3 choices of reticle color for contrast against any target / background (red, green and blue). 5 MOA reticle for quick acquisition. 20mm objective lens. Shock resistant to 1000g. Waterproof / fog-proof. Adjustable rheostat for brightness control. Lightweight / ultra compact design. Unlimited eye relief. Water and shock resistant. Tool-less click windage and elevation adjustments. Wide field of view. Integrated Weaver-style mounting system. Includes high and low mounting base. Battery included (3V-CR2032). Ideal for shotguns, handguns, rifles, muzzleloaders, paintball and crossbows. Lifetime Limited Warranty from the manufacturer.