PERFECT FOR MARINE - HD Marine binoculars with 7x magnification and 50mm objective lens;22 mm eye relief,6.8mm exit pupil,and field of view is 396 feet at 1000 yards / 132 meters at 1000 meters.ADAPT TO EXTREME ENVIRONMENT - Completly waterproof and float in water.Nitrogen-purged fog proofed Stable,comfortable to hold and highly durable.BRIGHT AND CLEAR - Porro prism system for a wide field of view.Premium BAK4 prism and Fully multi-coated optics produce bright,crisp images.COMPASS RANGEFINDER - Illuminated Compass built-in for direction location,with an internal rangefinder for determining distance and size of objects.MILITARY STANDARS - Non-slip rubber armor absorbs shock provides a firm grip.Tripod adapter fitting for tripod mounting for increased stability.