Sig Sauer Romeo Zero-Elite Red DotSig Sauer, ROMEO Zero, Elite, Red Dot, 3MOA Red Dot, 8 Daylight Illumination Settings, 20,000 Hours of Battery Life, 24mm Objective Lens, Steel Shroud, Black Carbon Infused Weapons Grade Ultralight Polymer Housing Provides Increased Shock and Drop Protection ROMEOZero Shield RMSc Footprint Aspherical Glass Lens with Zero Distortion Circle Dot or Single Dot Reticles For Fast Target Acquisition T. A. P. (Touch Activated Programming) and Button Activated