Perfect for marine - marine binoculars with 7x magnification and 50mm objective lens;24 mm eye relief, 7.1mm exit pupil, and field of view is 396 feet at 1000 yards / 132 meters at 1000 meters. Adapt to extreme environment - completely 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. Non-slip rubber armor absorbs shock & provides a firm grip. Tripod adapter fitting for tripod mounting for increased stability.