Bushnell 137501 Marine Waterproof 7x50mm and Powerview 8x21mm Binoculars with Accessory Bundle MARINE: Marine binocular with 7x magnification and 50mm objective lens | Well-balanced, bright and steady for long hours on the water OPTICS: BaK-4 porro prisms for bright, clear, crisp viewing | Fully Multi-coated optics for superior light transmission and brightness WATERPROOF/FOGPROOF: 100% waterproof / fogproof | O-ring sealed and nitrogen-purged to keep out moisture ARMOR: Non-slip, non-skid rubber armor cushions bumps and shock and prevents sliding and provides a firm grip when wet DESIGN: Hermetically sealed and features fold-down eyecups