AVAWO Red and Green Reflex Sight with 4 Reticles Multi-Reticle (4 patterns) or variable Dot (4 different sizes) are installed Tubeless design with 33mm reflex lens aperture provides a wide field of view, suitable for rapid-firing or shooting of moving targets besides normal shooting Parallax corrected & unlimited eye-relief; Allen head screw type windage and elevation click adjustments, with locking screw 4 Seperate ReticlesRail:22mm5 Brightness Settings.Tubeless Open Reflex Design. Package includes: 1X HD101A RED DOT SCOPE, 1X Cleaning Cloth, 1X CR2032 Battery ,1X Mounting tool ,1X Product Instruction