WHAT DOES HEAD MOUNTED NIGHT VISION MONOCULAR MEAN?

Quite possibly the most tricky visual time I skilled with a Gen. 1 was a moonless night below thick cloudy problems, but I could still see motion; and proved it to myself by obtaining my Grownup Little ones go outdoor and conceal powering a large tree, and afterwards both of those slowly but surely (and one particular swiftly) moved from that tree