TruGlo's Traditional Red-Dot Sight features a wide field of view for quick, accurate target acquisition. The multi coated lenses produce 95 percent more light transmission, while the anti-reflective interior eliminates stray light. The waterproof, fog-proof and shock-resistant body allows for high-quality optics in all weather. These sights have an integrated weaver-style mounting system. Includes one 3V CR2032 battery.