15 X 30 mm Powerful Prism Binocular Telescope Outdoor30 MM Diameter Ocular Lens:- Bring you a wide FOV, make eyes more comfortable to view scenery, bird watching, outdoors, ect.FMC lens & BAK4 prism :- Full multi coated lens green membrance and BAK4 porro prism provids high light transmittance, clearer vision and protect your eys.High Power Magnification :- With 15 x magnification, 40 mm objective lens professional binoculars for outdoor and indoor activities. Look clearer, see wider.Multi-coating Porro Prisms Provides exceptional optical performance. Higher refractive index rate, produce a brighter, clarity image.Ergonomic Body Design Ultra-popular size, Comfortable for extended viewing. Alloy body covered by rubber armor, Non-slip rubber armor for absorbing shock. Sturdy and durable.Center Focus System & Diopter Setting Simply adjust the thumb lever to switch from different magnification levels, Smooth and quick. Wide Range of Uses 15x magnification is great for a variety of uses from birding watching, travel, hunting, climbing, hiking, sports or concerts spectating, outdoor and moreProduct Details: Magnification power: 15x Objective diameter: 30mm Eyepiece diameter: 20mm Prism: BAK4 Lenses coating: FMC Exit pupil diameter: 4.5mm Eye Relief: 14mm Mini focus length: 1m/3.28ft Pupillary distance: 37-72MM, Field of view angle: 5.2° Waterproof: IPX5 Life Waterproof, Main Material: Magnesium-aluminum alloy +rubber