The Alpha Optics AO-1234 is a hand-held, head-mounted, helmet mounted, or weapon-mounted night vision system that enables walking, short-range surveillance, map reading, vehicle maintenance, and administering first aid in both moonlight and starlight. Each unit allows for vertical adjustment (by using head straps), fore-and-aft adjustment, objective lens focus, and eyepiece focus. The device is also equipped with an infrared light emitting source. The AO-1234 utilizes the principle of intensification of the residual light which is reflected from the surrounding objects. The optical system of the monocular consists of an objective lens, an image intensifier tube and an eyepiece. Even under unsteady brightness conditions, Automatic Brightness Adjustment System always keeps the IIT brightness level constant. The Automatic Protective System controls the existing illumination level through the photo receiver. If the illumination level surpasses 100-300 lx for the following 10 seconds, the Monocular will shut off automatically. Built-in IR Illuminator makes it possible to observe the objects when the monocular works in the conditions of low light or total darkness. Smooth and ergonomic design makes it an ideal choice for use by professionals or civilians for any nighttime operations.