Luna Optics® LED Rail Mount Infrared Illuminator. Powerful, compact, ESSENTIAL!This infrared beam stands out like a beacon in the darkness to your night vision system. Lightweight, compact, mounts to the Weaver / Picatinny rail of your tactical rifle, and blasts a fully-adjustable beam. Customize both the brightness and the width of the beam to your exact needs and environment. Make sure you have the edge on your next night patrol or unexpected late-night encounter!