Steiner Navigator 7x30 Binocular 3521 is exactly what you need for different types of waterborne challenges and activities. Fitted with high contrast optics and a decent light-collecting objective, the binocular offers vivid images in low light. It is complemented with features like 7x magnification, Sports-Auto-Focus system, Makrolon housing with NBR Long Life rubberized covering and a floating prism system. Also in the offing is an N2 injection system that seals 14-psi pressurized dry nitrogen, and provides water-resistant coverage of up to 16 feet. To add more, the Steiner Navigator 7x30 binocular is built to match mil spec, and is waterproof and shock resistant.