Ideal for shotguns, rifles, crossbows, handguns and more, Truglo Red-Dot Sights feature a wide field of view for quick, accurate target acquisition.The multi-coated lenses produce 95% more light transmission, while the anti-reflective interior eliminates stray light. The waterproof, fogproof and shock-resistant body allows high-quality optics in all weather. It has an integrated weaver-style mounting system and comes with one 3V CR2032 battery.