TRUa BRITE(TM)OPEN REDa DOT SIGHTa 2 choices of reticle color for contrast against any target / background.a 4-reticle choices for accurate targeting in any shooting condition.a Adjustable rheostat for brightness control.a Lightweight / compact design.a Unlimited eye relief.a Water and shock resistant.a Click windage and elevation adjustment.a Wide field of view.a 24x34mm window for ultra-fast target acquisition.a Anti-reflection coating on target side.a Parallax free from 30 yards.a Integrated Weaver-style mounting system.a Battery included (3V-CR2032).a Lifetime Limited Warranty.