The ROMEO-RS (Reinforced Steel) was specifically engineered to provide the accuracy and convenience of a pistol-mounted red dot at a cost that competes with high-end iron sights. Inspired by the design of modern striker-fired pistols that employ high-strength polymer and metal, the ROMEO-RS housing forms around a rugged steel chassis that supports and protects a premium aspherical glass lens. Threaded metal inserts allow for optimal torque load when mounting the optic to a pistol slide and installing the side-load battery tray, while additional metal inserts provide increased accuracy and strength for the windage and elevation adjustment mechanisms.The ROMEO-RS features a convenient side-mounted illumination adjustment button protected by a raised steel housing that prevents accidental interference, and the side-load battery tray makes battery replacements easy to do while maintaining zero. SIG SAUER's updated footprint design maintains true compatibility with industry-standard optics cuts while allowing for the additional lock-up strength provided by SIG-LOC recoil pins to eliminate the potential for any lateral shift.Built in Tualatin, Oregon, the ROMEO-RS was engineered to deliver premium red dot functionality at a cost that's within reach of any shooter. Hybrid design featuring a skeletonized steel chassis, molded into a high-strength polymer housingMolded glass aspheric lens for a distortion-free sight pictureHigh efficiency point source LED emitter with 8 individual brightness settingsLarge side control button for easy reticle adjustmentsConvenient side-mounted CR1632 battery tray with security screw for easy access without removing the optic from the firearmMinimum continuous runtime of 20,000 hoursMOTAC (Motion Activated Illumination) that powers up when motion is detected, powering down when inactiveDesigned, developed, tested and assembled in the USAFully Backed by SIG SAUER's Infinite Guarantee