Pentax UCF WP Waterproof construction allow these binoculars to be used in the most extreme weather conditions and be submerged to 1 meter Central fingertip control locks in diopter adjustment Black rubber housing to protect against dust and scratches Revolutionary dual-axis, single body housing with synchronized eye-piece adjustment to assure correct optical alignment Fully multi-coated optics to eliminate harmful ultraviolet rays while improving light transmission for high contrast images with no glare or flare