TRUGLO Red-Dot 40mm Sight Black 5 MOA reticle designed for quick acquisition. Shock resistant to 1000g. Waterproof / fog-proof. Unlimited eye relief. Wide field of view. BONUS! See-thru / flip-up lens caps, optical-quality / all-weather. Adjustable rheostat for brightness control. Lightweight / easy to mount. Multi-coated lenses produce more than 95 percent light transmittance. Special anti-reflective interior eliminates stray light from appearing inside the sight. Click windage and elevation adjustments. BONUS! Integrated lanyard system prevents loss of screw-down W/E caps. Integrated Weaver-style mounting system. Battery included (3V-CR2032). Ideal for shotguns, handguns, rifles, muzzleloaders, paintball and crossbows. Lifetime Limited Warranty.