Description Bright red dot allows for fast target acquisition and easy aiming. Compact and lightweight. 1x magnification allows both-eyes-open shooting. Parallax-free. Mounts to handguns, rifles and shotguns using Burris mounting systems. Automatic brightness sensor adjusts brightness to match the environmental conditions. Features 3 manual brightness settings. Windage and elevation adjustments. No special tool required. High-grade optical glass. Index-matched, Hi-Lume multicoating. Waterproof and shockproof. CR1632 battery included. Battery access is conveniently located on the top of the sight. Firearms, trailers, and some accessories are only available for purchase in stores. Each location follows all BATF and individual state/county/city laws to insure the desired product is legal for sale. Any info provided online is subject to change, please go to your local store for more accurate information.