A night vision goggle or night vision scope is a device that allows you to see in the dark. It does so, by enhancing the existing light even if it is just a little with an image intensifier tube. Its lowest setting can let you see about ¼ mile ahead of you. But its highest setting can let you see about 1.25 miles ahead of you. However, the greatest distance it can let you see is about 2500 yards. If you are planning on using it for hunting, then it is probably best to buy the highest settings.