Compact closed red dot sight with M1913 rail interface. Low Dispersion LD glass lens design with high-performance coatings. 2 MOA red dot provides ten illumination settings for visibility in all light conditions. Battery-conserving motion sensor for automatic on/off. Manual brightness controls are easy-to-reach. 0.5 MOA adjustments. Waterproof and fog proof performance. Operates on side-loading CR2032 battery.