CAT Color Adjusted Transmission amplifies contrast in the peak human vision sensitivity range, to spot game in any environment Optimized Light Transmission with latest generation advances in low light performance and brighter images and up to 3-4% better light transmission Lightweight Roof Prism Design has less bulk to fit in your pack and stay out of the way while hunting Fast-Close-Focus central focusing wheel requires minimal rotation for quick, absolute sharpness from close up to infinity Makrolon housing is durable polycarbonate with NBR Long Life rubber armoring, creating a lightweight, rugged chassis that withstands 11 Gs of impact