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optics, stay true to their one simple mission; to produce high quality optics at affordable prices. Their items are lightweight, compact, and quite durable. Extreme care is taken in the construction and design of each optic, and special attention is paid to the art and physics of optical science. This level of quality control ensures that each device is a joy to hold, use, and look through. The Patrol 2x24 Night Vision Monocular features a lightweight and compact form-factor with excellent ergonomics for a comfortable viewing experience, especially during intensive and prolonged periods of observation. The Patrol monocular fits into most hands easily, delivering a surprising level of comfort and usability. The controls are well positioned for ease of use, and intuitive operation of the device under low-light conditions. Observation during total-darkness is made possible by an integral IR illuminator; regardless of your viewing conditions, this handy NVD will bring the power of sight without light to whatever your game-plan is. There are many different variables that affect the distance that one can see with a night vision device, among them the object's size, the level of details being sought from the object and the conditions of observation. Night vision devices detect much further under a full moon and clear skies than they will under a new moon and cloudy skies. Many different formulas are used to determine the statistic of maximum viewing range and the method of calculation varies by manufacturer. The important factors to consider when evaluating any night vision device are the intensifier tube's generation, s/n ratio, level of magnification, specified resolution, along with the clarity & light transmission efficiency of the optical system. All night vision devices sold by B&H have mechanisms in place to protect the intensifier tube from a sudden burst of bright light, but this does not mean that bright light doesn't damage the device. No matter what, bright light in any form is not good for the longevity and performance of image intensifier tubes.