SVBONY Red and Green Dot Sight Reflex Sight Tactical 4 Reticles 5 Brightness Levels 20mm Mount 33mm Reflex Lens and 2 Allen Screws Red and green illuminated reticles with 4 patterns offer unlimited eye-relief and corrected parallax;built-in 20mm Picatinny easily sight remounting Tubeless design with 22x33mm reflex lens aperture gets a wide field of view;each click adjustment moves the point of the impact by 1 MOA;approximately 1at 100 vbs;1/2 at 50 yards;suitable for rapid-firing or shooting of moving targets besides normal shooting Choose 5 different levels of brightness according to the different environment and light condition;MOA precision adjustment;windage adjustment for right and left;elevation adjustment for up and down with 2 Allen screws adjustment for more accurate target shooting Made of high grade aluminum alloy;ultra lightweight and compact;the dot sight is also durable;waterproof and shockproof;MC lens enhance light permeability;protective cover can avoid the lens scratch and dust attach;ensure clear reticle 4 different reticles with red and green dot sights provide unlimited eye relief no matter day and night;catering to most individual sighting needs;it's easily and quickly get the moving and rapid firing target;one CR2032 battery included