BIAL 16x40 Dual Focus Portable Mini Golf Monocular Outdoors Hunting Camping Travel Telescopes Mulit-coated optics upgraded version of the green AR With the low-light-level night vision built-in design, it has highly distinct version as long as with the reflect light in night With the Dual Focus design: can look the much longer distance and more distinct waterproof design: the mirror is full of the high purity nitrogen, waterproof and antifogging, you can use it in raining day and humid environment without any worry The fully coated optics, meanwhile, guarantee superior light transmission and brightness, helping you see just about any target