Ideal for shotguns, rifles, crossbows, handguns, and more, Truglo Red-DotSights feature a wide field of view for quick, accurate target acquisition.The multi coated lenses produce 95% more light transmission, while theanti-reflective interior eliminates stray light. The waterproof, fog proof,and shock-resistant body allows high-quality optics in all weather.Integrated Weaver-style mounting system. Includes one 3V CR2032 battery.3.8" long. 5 MOA.