housing for durability and features advanced multi-coated optics. The device can be outfitted witheither a Gen 2+ or Gen 3 high-performance image intensifier tube (IIT). The bright light cut-off featureensures that the high-quality photocathode tube is protected. The NVG is also equipped with Manual Gain Control which adjusts the image brightness providing the highest possible image quality even inchanging light conditions. Operating from a single AA alkaline battery or CR123A battery the NVG canrun up to 20 hours. Also equipped with an integral infrared illuminator for reading in the dark. NVG Interface Shoe (preinstalled) is used for installing the NVG to a either standard dovetail type headset and helmet mount. Bayonet/Horn Interface Shoe (included) is used for installing the NVG to a either standard bayonet/horn type headset and helmet mount. NVG Interface Shoe with Connector (optional) is used for installing the NVG-40/NVG-50 to either standard dovetail type headset and helmet mounts and connecting the Battery Pack. Mini-Rail Interface Shoe is used for installing the NVG to the mounts with mini-rail interface. Mini-Rail Interface Shoe is included to the optional AGM Goggle Kit W and AGM Helmet Mount