The ROMEO-X Enclosed pistol red dot from SIG SAUER. Featuring a robust CNC 7075 aluminum housing and aspherical glass lens system built around a high-efficiency point source emitter, the ROMEO-X Enclosed creates a rock-solid, distortion free, aiming solution for the most demanding shooters and circumstances. Equipped with a side-mounted battery compartment and SIG SAUERs patent-pending beryllium copper flexure system, the ultra-low deck height allows for effortless co-witness with standard height irons and is available in both Pro and Compact standardized footprints. Other features MOTAC (Motion Activated Illumination); 20,000 hour battery life with side load battery and 15 illumination settings including 3 night vision.