Danubia Night Observer Monocular 100 is a light amplifier for use in dusk with a maximum viewing range of 150-200m. The built-in infrared illuminator means observations in complete darkness are possible within a range of max. 100m. The Night Vision Monocular is adaptable for eyeglass wearers with a diopter adjustment -5 to +5. Made from a water-resistant housing with a 1/4" tripod socket. Includes a nylon case for transportation of this Night Observer Monocular.