HX Combat Gear Open Red Dot Sight Tubeless design with 33mm reflex aperture provides a wide field of view, suitable for rapid-fire or shooting of moving targets Multi-Reticle (4 patterns) or Vaiable 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. Light-weight, waterproof & shockproof. Low power consumption for long battery life.