The porro prism Navigator Pro Series is the choice for recreational boaters, weekend anglers and hobby sailors. It offers exceptional performance for the price with many of the features found on premium, world-famous Steiner marine binoculars. Although not built to military specification, they will provide a lifetime of use for most water enthusiasts. Delivers excellent image clarity, sharp definition and contrast, and oversized light-gathering objective for bright picture in low light Features 7x Magnification is the marine standard, with a wide, stable image for tracking other boats, buoys and bridge numbers even in rough water. High Contrast Optics provide bright, sharply contoured images with natural color definition for outstanding viewing quality suitable for both beginners and professionals. Floating Prism System uses flexible silicone lens mount to absorb severe shock, impact and abuse without damage Sports-Auto Focus(TM) System lets you focus each eyepiece to your vision once, then keeps images razor sharp from 20 yards to infinity. No more chasing focus on moving objects. MakrolonA(R) housing is durable polycarbonate with NBR Long Life rubber armoring, creating a lightweight, rugged chassis that withstands 11 Gs of impact. Impervious to harsh conditions for generations of trusted use. N2 injection(TM) system seals 14-psi pressurized dry nitrogen into the optic, for fogproof clarity in any condition - from artic cold to desert heat. Specifications Focus System Sports-Auto-Focus(TM) Optics Systems High Contrast Close Focus 66 Exit Pupil 7.1 mm Luminosity 51 Twilight Factor 18.7 Eyecups Cylindrical Rubber Armoring NBR Long Life Waterproof Submersion to 16 ft. Weight 36.3 oz. Dimension (HxWxL) 5.5 x 8.1 x 3.0 Neck Strap Neoprene Neck Strap Attachment ClicoLocA(R) Warranty Heritage Warranty Objective Cover Yes Rain Protection Cap Yes Carry Case Yes