The ROMEO-RS Pro (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 Pro housing forms around a rugged steel chassis that supports and protects a premium aspherical glass lens.Features :Hybrid design featuring a skeletonized steel chassisMolded glass aspheric lens for a distortion-free sight pictureLarge side control button for easy reticle adjustmentsMinimum continuous runtime of 20,000 hoursHigh efficiency point source LED emitter with 8 individual brightness settingsMOTAC (Motion Activated Illumination) that powers up when motion is detected