The FRE 1x18 red dot by Vector Optics, which has been producing sight for firearms, for over 10 years. Housing made of 6061 aluminum alloy with a durable matte black finish. Additionally sealed to ensure waterproof. Optics glass is covered with an anti-reflective multi-coating. It has a 4-step brightness adjustment of the red aiming point with the size of 3MOA. Elevation and Windage adjustment range 60MOA. Shockproof and tested on .30-06 ammunition. Reflex sight powered by CR2032 battery (not included). Comes with a Picatinny rail mount and lens cover.