Low Dispersion (LD) glass lens design with high performance coatings for excellent light transmittance and zero distortion; 2 MOA dot for close quarters battle to mid-range target engagement; MOTAC (Motion Activated Illumination) powers up when it senses motion and powers down when it does not. Provides for optimum operational safety and enhanced battery life; 62,500 hours of continuous battery life in medium illumination setting; Ready to mount with a standard QD mount provided, but can be customized with vertical spacers to fit a variety of systems; Dependable waterproof (IPX7 rated for complete water immersion up to 1 meter) and fog-proof performance; Engineered with the optical axis at 1.535 inches for magnifier, NV or thermal co-alignment; SIG SAUER Electro-Optics Infinite Guarantee; SIG SAUER Electronic Component Limited 5-Year Warranty