Internal center focusing, simple adjustment, enhanced waterproofing and a clean appearance.A compact, light and convenient pair of waterproof binoculars, the Coastal 400 binoculars are an excellent choice for boating or other rugged outdoor activities. Nitrogen-charged interior eliminates fogging on internal lens surface. BAK-4 prisms for bright, sharp images. Rubber-coated body for shock resistance.Key FeaturesInternal center focusing: Simple adjustment, enhanced waterproofing and a clean appearanceNitrogen charged interior: Eliminates fogging on internal lens surfaces even in severe conditionsBAK-4 Porro prism: For bright, sharp images across the field of viewRubber armored body delivers great shock resistance and a secure, slip-free grip7 x 50 binoculars: Best size for all-around use onboard the moving deck of a boatIPX7 Waterproof rating: Submersible for 30 minutes at a depth of one meterOwner's Manual