Ask the Community

I don't know why but here is some info for you. http://www.truglo.com/optics-red-dots/multi-reticle-dual-color-red-dot-sight.asp

The TRUGLO Red Dot Sight helps you acquire and engage your target quickly with its 2x magnification and 42mm lens. This easy-to-use 2.5 MOA red dot sight is great for shooters of all levels and works equally well with handguns, shotguns, rifles and even paintball guns. Its rugged construction will last through any shooting application. Ten brightness sightings let users balance the reticle brightness to produce the best contrast for the lighting situation.