The lightweight TruGlo Red-Dot sight has a 5 MOA reticle that's specifically designed for quick target acquisition. 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. Waterproof, fog proof, and shock proof design. Rheostat for brightness control. Unlimited eye relief. Integrated Weaver-style mounting system for easy mounting on most shotguns, rifles, handguns, muzzleloaders, paintball guns, and crossbows. Integrated lanyard system prevents loss of screw-down W/E caps. Operates on one 3V-CR2032 battery (included).