Tubeless design with 42mm reflex lens aperture provides quick target acquisition, also a wider field of view to maintain situational awarenes. | 4 Selectable reticles and 5 brightness settings. Low power consumption for long battery life. | Integrated mount for standard 20mm Picatinny or Weaver rails which will not loose, made to last. | Parallax corrected & unlimited eye-relief. Fully adjustable height, brightness, windage and elevation. Where the dot goes, so does the bullet! | Made of high grade aluminum alloy which makes the red dot sight durable and light weight.