Bushnell H2O 10x42 Porro Prism Waterproof/Fogproof Binocular 10 X 42Mm Measurements Compact &amp; Durable Waterproof Design Is O-Ring Sealed &amp; Nitrogen-Purged For 100% Reliable, Fog-Free Performance Waterproof, fogproof binoculars designed for use on or in the water O-ring-sealed and nitrogen-purged to complete lock out moisture Rubber armoring with textured pads; large center focus knob 10x magnification and 42mm objective diameter; tripod-adaptable Twist-up eyecups and long 16mm eye relief; limited lifetime warranty