* 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.* Multi-Reticle (4 patterns) or Variable Dot (4 different sizes) are installed.* Parallax corrected and unlimited eye-relief.* Allen head screw type windage and elevation click adjustments， with locking screw.* Built-in mount (integrated rail) for standard bases， no need to rezero when remounting the dismounted sight.* Very light weight， waterproof and shockproof.* Low power consumption for long battery life.