Holosun produces a high-quality red-dot optic, without needing to spend three to four times as much on an Aimpoint. Designed for day and night use, this high quality sight comes with 12 brightness settings (2 night vision settings), is night vision compatible with all generations of night vision devices, parallax-free with unlimited eye relief and Includes wind age and elevation adjustments; Per click: .5 MOA. New advantage technology LED allows 50,000 hours of operation on one CR2032 battery. Its made out of high strength aluminum and is fully waterproof and submersible to 100 feet. This sight is very similar to the Aim point Micro Red Dot Sights but at a fraction of the cost. Lowest profile emitter on the market. The Front Lens is angled to prevent glare. Extremely Durable Includes lower height mount and low base Runs on one CR2032 3v battery Objective diameter: 20 mm (glass), 28 mm (ring).