*Reflex Sight in Tubeless design with 33mm reflex lens aperture provides a wide field of view.*Dual illuminated ( red and green), reflex sight with 4 reticle shapes, provide various choices in different occasions, like sunshine, cloudy day.*Parallax corrected & unlimited eye-relief; Red dot with Allen head screw for windage and elevation click adjustments, with locking screw.The center hight of CVLIFE reflex sight is about 1.44 inch, high enough to see over a standard front iron sight.red dot reflex sightThis red green dot reflex sight can co-witness with your front sights.