Essential for wildlife observers and big game hunters, the Bushnell Marine 7 x 50 Binoculars feature a rangefinder, illuminated compass and BaK-4 porro prisms for bright, clear viewing. The 100% waterproof, fog-proof construction is O-ring sealed and nitrogen purged to keep out moisture. Nonslip, nonskid rubber armor protects against shock and prevents sliding while providing a firm grip, even when wet. Hermetically sealed. Highly resistant to saltwater corrosion. Fold-down eyecups.