Compact size, weight with unlimited eye-relief and ultra-low parallax operation; Night Vision Override - Switch between NV and Maximum brightness with the press of a button; D.A.R.C (Dark Adaptive Reticles and Coatings) - Specialized lens coatings and reticle brightness settings that are optimized for use with GEN 3+ NV Devices; Motac - Motion activated illumination control powers up when it senses motion and powers down when at rest; Extends the LED runtime in excess of 50,000 hours in normal use; Comes installed with 1.41 in. absolute co-witness MIL-STD 1913 mount; Optional 1.63 in. Lower 1/3rd riser kit included; Milled from aircraft grade 7075-T6 CNC aluminum ensures a lifetime of reliable service; Dependable IPX-8 waterproof and fog proof performance (up to 20 meters submersion for 2 hours); 4 user-selectable reticles; Hex bolt mount; Sig Sauer Electro-Optics Infinite Guarantee