Don't just hunt in the dark, hunt in the cold dark with the Laser Genetics ND-1 Subzero. Unique circuitry allows for use down to 0° Fahrenheit without sacrificing performance. Nine fully multicoated lenses intensify the beam, giving you a crisp and clear beam of light up to 100 yards. Its custom mount is compatible with any 1" or 30mm tube so it can be used with virtually any scope. Machined from aluminum alloy it's extremely lightweight, rugged and water-resistant. Runs on one CR-123A battery (included), which lasts for up to three hours.