Immediately beneath the lens is a really massive infrared illuminator, for which the depth could be manually modified through the eyepiece’s inner LCD display. And on the rear adjacent into the eyepiece is an additional dial which i initially mistook for a spotlight Handle, but is really a screw-on cap https://nightvisionmonocular50483.theideasblog.com/27483665/5-essential-elements-for-head-mounted-night-vision-monocular