*Illuminated red and green dot sight with 4 patterns and 7 brightness levels of each color, easily controlled with two knobs.*Cameraless design with 39mm reflective lens aperture provides a wide field of view.*With quick detach mount, the dot sight can be quickly and easily installed on 20mm or weaver rail. Locking screw for elevation and windage adjustment.Illuminated Red & Green Dot Sight with 4 patterns and 7 levels of brightness of each color, which is easily controlled by two knobs.Tubeless design with 39mm reflex lens aperture provides a wide field of view.