The Eotech 512 Holographic sight is Eotech's non-night vision compatible, "AA" battery powered model. It is the same as the 552 Eotech sight but without the night vision compatibility. The Eotech 512 and all other Eotech Holographic Diffraction Sights are the most advanced weapon sighting system in the world. Utilizing a holographic lens similar to the heads up display used in military fighter aircraft. The Eotech 512 sight has a 1 MOA red dot for precision work as well as a 65 MOA circle for close quarter shooting. The Eotech 512 sight has 20 brightness settings allowing it to work in either bright sunlight or very low light. The aiming dot is even visible if the lens is broken. When used in Close Quarter Battle(CQB) environments, this revolutionary optic delivers peripheral vision, and leaves no muzzle side operator signature. It is covered with an allow hood for extreme durability. It can be removed without tools and works on any weaver/Picatinny rail.