The Knight Vision MIL Spec AN/PVS-30 Clip-on Night Vision Weapon Sight, adds the latest high performance Gen 3 light intensification night vision to most rifles and day scopes. This product is appropriate for front line long range rifles. The Knight Vision patented technology makes the AN/PVS-30 universal and assures the accuracy of your range-tested day scope boresight will not be degraded. When the AN/PVS-30 is added in front of your dayscope, your existing optic, eye relief, and cheek weld are undisturbed. The refractive lens provides high performance light collection in a light weight design. Knight Vision patented Single Interchangeable Battery (SIB) allows use of either 123 or AA single batteries, with a battery life exceeding 24 hours, and can be changed while you remain in shooting position. The highly efficient power circuit allows use of depleted flashlight batteries to provide several hours of operation. The AN/PVS-30 is optimized and tested for medium and long-range sniper weapons including .50 caliber rifles and daysights with magnification up to 20x.