Ideal for all-day shooting, 11 brightness settings allow you to adjust to changing light conditions. Blue-tinted, fully multi-coated lenses increase light transmission for less haze and extra-vibrant colors. 5-MOA red dot allows you to easily zero in on targets. 30mm tactical ring for mounting to a Picatinny rail. Flip-up lens covers protect glass. Uses one CR-2032 battery (not included).