Bushnell 137501 Features: -Marine 7 x 50 mm binocular. -BaK-4 porro prisms for bright, clear, crisp viewing. -Fully multi-coated optics for superior light transmission and brightness. -100% waterproof / fog proof. -O-ring sealed and nitrogen-purged to keep out moisture. -Highly resistant to saltwater corrosion. -Non-slip, non-skid rubber armor cushions bumps and shock, prevents sliding. -Provides a firm grip when wet. -Hermetically sealed. -Fold-down eyecup.