The NightStar Generation 1 Night Vision Monocular - 4x50mm has been designed to be the ideal monocular for prolonged observation during the dark nights. Equipped with a high-power infrared illuminator, the user can get a bright, clear image no matter how dark the conditions and its compact body makes for easy travel. The NightStar Night Vision Monocular features lightweight, durable polymer construction that is built for endurance and a 4x magnification lens for medium range observation. The NightStar Gen 1 Night Vision Monocular includes an automatic shut-off feature that turns off the nightvision unit when exposed to bright light sources, saving the night vision tube and ensuring years of operation. The NV Monocular is protected by the NightStar Limited Lifetime Warranty and the quality that comes with the NightStar Night Vision name. NightStar-Make Your Bright! Specifications for NightStar 4x50mm Gen-1 Night Vision Monocular: Manufacturer: NightStar Night Vision Generation: Digital System/Lens Resolution: 32 - 36 lp/mm Field of View, Angle: 15 degrees Diopter Adjustment Range: +4, -4 dpt Condition: New Magnification: 4 x Color: Black Objective Lens Diameter: 50 mm Eye Relief: 12 mm Image Intensifier Color: Green Phosphor Magnification Type: Fixed Package Contents: NightStar 4x50mm Gen-1 Night Vision Monocular, Black NS41450C