The SIG SAUER ROMEO-RS Compact Red Dot Pistol Sight was designed to provide the durability, speed, and accuracy of a pistol-mounted reflex sight at a price that competes with high-end iron sights. The ROMEO-RS Compact features a skeletonized steel chassis molded into a high-strength polymer housing, providing a high degree of durability without excess weight. The reinforced steel chassis and polymer housing protect a premium aspherical glass lens that provides superior light transmission and clarity. Featuring MOTAC motion-activated illumination, the ROMEO-RS activates when it senses movement and powers down when inactive helping to reach 20,000 continuous hours of operation on one CR1632 battery. When it's time to change the battery, the side-loading compartment makes it a simple process. For sturdy mounting, the ROMEO-RS features threaded metal inserts for optimal torque load when mounting the optic to a pistol slide, providing maximum lock-up strength and eliminating the potential for lateral drift. Backed by the SIG SAUER Infinite Guarantee. Ideal for thinner compact and subcompact pistols High-efficiency point-source LED emitter with 8 brightness settings Skeletonized steel chassis molded into a polymer housing Premium aspherical glass lens Side-loading battery tray Large side controls before Motion-activated illumination 20,000 hours of operation on one CR1632 battery