The AT3 RD-50 PRO Red Dot sight features a crisp 2 MOA red dot reticle, waterproof housing with shockproof internals, with included riser mount and rubberized armor. Exceptional battery life up to 50,000 hours at the lowest brightness setting. Genuine Renata CR2032 Lithium battery included. The parallax-free design allows for accurate, both-eyes-open shooting. RD-50 Red Dot Sight Renata CR2032 Battery RM-ARMOR Rubber Shroud with Lens Covers Included. Two co-witness options Integrated included low mount red dot riser mount included - 1.0" Riser Allows for a greater.