Wide 64.5° Apparent Angle of View 59-76mm interpupillary distance range accommodates users of all sizes Powerful 15x magnification, allowing detailed observation and identification of distant subjects Scratch-resistant ArmorTek exterior lens coatings repel oils and corrosive materials from lenses to keep views clear without residue Argon filled and O-ring sealed to be waterproof and resistant to internal fogging when moving through extreme temperatures and environmental conditions