*Red and green illuminated reticle with four patterns, 9-level brightness adjustment.* Reflective sight has 40mm lens with tubeless design for wide view, ideal for fast shooting and moving targets*Unlimited and parallax corrected eye relief. The red dot sight is very easy to zero and maintains zero for longer periods of time, providing greater accuracy.Red & Green dot have 9 illumination intensity suitable for various environments.Tubeless design with 40mm reflex lens aperture provides a wide field of view.Very easy to zero and keep zero.Parallax corrected and unlimited eye-relief.Offers 4 different reticles.High quality aluminum alloy increase the durability of your reflex sight very sturdy.Low power consumption for long battery life.The one hour auto-power shut-off feature makes you no worry to forget turn it off.Integrated mount for standard 20mm Picatinny or Weaver rails.