Trijicon RM01 RMR 3.25 MOA LED Red Dot Sight 3.25 MOA LED RMR: Automatically adjusts illuminated reticle to available light conditions. Adjustment @ 100 yards (clicks/in): 1. CR2032 battery lasts 2 years of typical use, 5 years in dark storage UNIQUE PATENTED HOUSING SHAPE: Forged 7075-T6 aircraft aluminum-alloy housing shape diverts the force of an impact away from the lens, greatly increasing the durability of the sight TRUE-COLOR MULTI-COATED LENS: Creates a wide-band light transmission for minimal change in target area color ADJUSTABLE WINDAGE / ELEVATION: Easily adjustable without special tools. 1 MOA per click VERSATILE SIGHT: Multiple primary applications including rifle, pistol, shotgun and carbine, or use as a secondary sight with a magnified optic