One of the smallest zoom monoculars on the planet, yet well equipped with lens multi-coating and BaK-4 prism glass for a sharp image when you need it. Compact size keeps it close at hand, ready for use. Bak-4 Prism glass, Full multi-Coating, Tripod compatible, Power: 10X-30X, Objective Diameter: 21mm, Eye relief: 12mm, Exit pupil: 2.4mm-1.8mm, Field of view: 178ft-10ft @1,000yds, Aluminum body, Weight: 3.2 oz. Includes: lanyard and case.