[Professional binoculars with zoom] - Bak-4 prism design and multi-layer coating provide better image brightness, contrast and quality. Compared to Bak-7, Bak-5 prism has better performance. Its refractive index is higher and it can effectively avoid dark angle. This makes his image clearer and brighter.[20x50 binoculars with night vision] - The large eyepiece has a better view and a wider field of view. The larger lens has more light, higher brightness, and a wider field of view. When the lens size is less than 41mm, visibility and darkness are small corners.[Durable Body] -Environmentally friendly rubber with abrasion-proof and moisture-proof material accompanies you to explore the world. The skid design based on the principle of camera appearance gives you a more comfortable grip. The nitrogen-filled waterproof design enables the Feldstecher binoculars to function properly even if they fall into a water pit.[Easy to adjust] - The center focus button of this binoculars hunting allows for quick and high-precision focusing. And it can also be focused on the different distances with the right eyepiece ring. Use with a tripod is fine. So it comes in very handy when you watch something for a long time.[Multi-function and customer service] - Our waterproof binoculars are great for bird watching, hiking, hunting, sightseeing, basketball, rugby, sports competitions and concerts. And it is also a best gift for adults, children.