Built for medium- and long-range applications, the D-750PW 4x66 Elite White Phosphor Night Vision Sight from Bering Optics employs HD multicoated lenses, a Mil Dot reticle in your choice of red or yellow, and 1/4 MOA impact point correction for accurate nighttime targeting. Its autogated Photonis white phosphor tube produces a black-and-white image, which many night hunters prefer to traditional night vision green, and maintains image quality in changing light conditions. Manual gain control allows you to achieve the brightest possible image in any light level without sacrificing the sharp detail of 64-72 lp/mm resolution. Nitrogen-filled (and refillable) to prevent fogging and IP67 waterproof, the sight will hold zero on medium-caliber rifles and can be used effectively with weapons up to .50 caliber or 12 gauge. A pair of AA batteries will power the sight for up to 120 hours.