Sig Sauer Romeo-X Enclosed Reflex Sight 3 MOA Green Dot Black Compact FootprintSig Sauer Romeo X Enclosed Reflex Sight 3 MOA Green Dot Black Compact Footprint Fully enclosed and sealed optical system; CNC 7075 aluminum housing; Aspherical lens; Point source emitter; Patent pending beryllium copper flexure arm; MOTAC motion activated illumination; Reticles: 3 MOA red dot, 6 MOA red dot, circle dot; 15 illumination settings, including 3 night vision; Side load battery compartment; Battery life: 20,000 hours; Ultra low deck height;