DESC: The Night Optics USA D-221B-ST is a powerful night vision binocular. True stereoscopic vision is possible, and enhanced, by two second generation plus intensifier tubes. Depth perception can be a crucial concern and this binocular offers outstanding three dimensional viewing in a cost effective, feature laden package. This lightweight unit is a multi use, professional system offering versatility and performance not found in single tube designs. High quality objective and ocular lenses provide a clear sharp line of sight, while the second generation plus intensifier tubes deliver an outstanding 28 - 38 lp/mm of resolution. Automatic Brightness Control ensures even illumination in fluctuating light conditions.