The RXS-100 Reflex Sight features a point source LED to create a clean beam that produces a strong dot without wasting battery life. There are 8 brightness settings to allow a clear day light viewing and low settings for nighttime visibility. The top load battery is easy to replace without having to remove the sight from the firearm. This sight mounts onto an array of pistols, AR?s and shotguns and is compatible with all common red dot mounts with DeltaPoint Pro footprint and included weaver low-rise mount. It is built with rugged, aircraft grade aluminum to ensure the glass and internal electronics are protected.