This is the Aimpoint CompML3 4MOA sight. It features the Advanced Circuit Efficiency Technology (ACET) which gives the sight unparalleled battery life and ease of use. On a setting of 7 out of 10, one single battery will last 50,000 hours of operation. This sight was built primarily for law enforcement and armed forces use to hold up under the roughest physical handling and most severe weather. It is submersible up to 135 ft. This sight comes with a replaceable, protective, outer black rubber cover. The reticle dot size is 4 MOA.