Marine binocular with 7x magnification and 50mm objective lens Illuminated, analog compass and ranging reticle BaK-4 porro prisms for bright, clear, crisp viewing Fully multi-coated optics for light transmission and brightness 100% waterproof / fogproof and resists saltwater corrosion O-ring sealed and nitrogen-purged to keep out moisture Non-slip, non-skid rubber armor cushions bumps and shock Armor also prevents sliding and provides a firm grip when wet Hermetically sealed Fold-down eyecups