The celestron oceana 7x50 binoculars are waterproof and designed marine use rrfeaturesr 7x magnification porro prism binocularr large 50mm objective lens offers maximum image brightness in low light conditionsr backlit illuminated liquid dampened magnetic compass makes this an excellent navigational tool for land or sear horizontal and vertical etched reticle to help determine the relative size of objectsr range finding dial calculates actual object distance or sizer four element objecti