The military binocular is a waterproof floating binocular designed to meet military standards.it can be performed in all weather conditions,even under extreme rainstorms or high humidity condition.so it can provide you with all the tools needed for your next outdoor activities.such as marine,birding watching,hunting, sports matches watching,wild travel and more.etc. it works with distance measurement and built-in compass for positioning. by specifying a ruler, you can directly calculate the distance of an object on the left eyepiece. with a lighting compass, you can calculate the direction. it has superb visual clarity premium large bak-4 prism and fully multi-coated objective lens and eyepiece ensures that the image you view will be more brightly and sharply, offer the best option for any outdoor lovers whom like outdoor adventures.