The Vortex Venom Red Dot Sight has 10 brightness settings and features a large, bright red dot reticle. It has easy to use power and illumination controls on the left-side of the optic. You can remove the CR1632 easily from the top without removing the red dot from your firearm. It is strong enough to handle powerful recoil and fits on a AR-15, shotgun, rifle or handgun. The high-quality, fully multi-coated lens offers a clean, wide field of view. Choose between 10 levels of brightness in manual mode or switch to auto mode. Flush 1 MOA windage and elevation adjustments are sleek and make sighting easy. The Vortex Venom Red Dot Sight includes a Picatinny mount, T-15 Torx wrench, and CR1632 battery. It is available in two models; 3 MOA or 6 MOA dot.