HDX optics extra-low dispersion glass combined with high transmittance glass (HT) provide optical clarity for any situation and up to 98.6% light transmission; Side Focus Adjustable From 45 Yards To Infinity; Dependable waterproofing (IPX-7 rated for complete immersion up to 1 meter) and fog-proof performance; Removable Throw Leaver For Quick Magnification Changes; Proprietary MOA Milling Hunter 2.0 reticle designed for the needs of long-range hunters