TRUGLO Tactical Red-Dot 30mm Sight Dual-Color Black Dual-color illuminated reticle allows choice of red or green for faster target acquisition in low-light conditions. Waterproof / fog-proof / nitrogen gas-filled. Generous 4" eye relief. Fully-coated lenses provide maximum brightness, clarity and contrast. Adjustable rheostat for brightness control. Rubber eye-guard. Fingertip windage and elevation adjustment. Durable leaf-spring for windage and elevation adjustments. One-piece tube made of aircraft quality aluminum. Durable, scratch-resistant, non-reflective matte finish. Lifetime Limited Warranty.