From the ManufacturerLike the name says, these binoculars are made for water. Splash them, soak them, dunk them - and they'll emerge 100% fog free and dry inside. Perfect for skiers, snowmobilers, anglers and kayakers. True waterproof construction and a rugged, non-slip rubber design makes the H2O series a simple choice for those whose lifestyle borders on the hyper side of active. O-ring sealed and nitrogen-purged for waterproof/fogproof protection in any season, both the fully and the multi-coated optics render bright, clear images. Take them with you - everywhere.Specifications for this Bushnell binocular include: Magnification: 10x Objective lens: 25mm Field of view at 1,000 yards: 305 feetTech TalkObjective Lens: The diameter of the objective or front lens. The larger the objective lens, the more light that enters the binocular, and the brighter the image.Field of View (F.O.V.): The side-to-side measurement of the circular viewing field or subject area. It is defined by the width in feet or meters of the area visible at 1000 yards or meters. A wide angle binocular features a wide field of view and is better for following action. Generally, the higher the magnification, the narrower the field of view.Roof Prism System: In roof prism binoculars the prisms overlap closely, allowing the objective lenses to line up directly with the eyepiece. The result is a slim, stream-lined shape in which the lenses and prisms are in a straight line.Product DescriptionBushnell H2O Binocular, 10X25mm, Roof Prism, Black Finish 130105