HIGH POWERED AND A LARGE FIELD OF VIEW - The 10x magnification ensures closeup viewing at a distance. At 1000 yards, the field of view is 331ft. The generous 42 mm lens diameter gathers a large amount of light, and the fully multi coated optics ensure maximum brightness and clarity. WATERPROOF AND FOGPROOF - This binocular is both waterproof and fogproof making it ideal for outdoor activities near or on water. VERSATILE - The compact roof prism design is ideal for a wide range of activities including bird watching, hiking, hunting, camping, wildlife observation or even whale watching on a cruise. QUALITY ASSURED: Manufactured by Bresser and licensed by National Geographic, you can be assured of quality construction and support after the sale. YOUR PURCHASE HAS PURPOSE: Every purchase helps support the global nonprofit National Geographic Society in its work to protect and illuminate our world through exploration, research, and education.