The Laser Genetics ND-3 SubZero Laser Designator w/ Scope Mount uses patented technology to create true night vision and turns your scoped rifle into a night hunter. Combining a powerful, green laser diode and a precision optical collimator, the Laser Genetics ND3 Water-resistant Laser Illuminator Sight pairs with your scope and allows you to cast a bright beam of green laser light to fully illuminate targets up to 250 yards. Rotating the collimator ring to minimum creates a bright micro beam of green laser light visible up to 3 miles and rotating the same collimator to a wider setting it can be used as a light source in close quarters or following a trail in conditions with low natural light. The Laser Genetics ND-3 SubZero Laser Designator uses green laser technology because research has proven that green light is the most visible to the human eye and requires the least amount of eye adjustment at night. Compact Laser Sight: Length: 6.75in x 1.25in dia. (171.45mm x 31.75mm) Construction: Precision Machined High Tech Aluminum Alloy Finish: Anodized Matte Black Tube Size: 1in (adapts to many mounting systems) Wavelength (Color): 532nm (green) Range: 3 miles Power Supply: One lithium CR123A battery (included) Battery Life: Up to 7 hours, Up to 3 hours at 0°F Output Power: 18 mW Lens Diameter: 26mm Weight: 5.37 oz FDA Safety Class: Class 2M Water Resistant: Yes Features of Laser Genetics ND3 Laser Illuminator Sight: O-ring seals keep out water dust and dirt Nitrogen charged to prevent lens from fogging Adjustable Beam (Rotary Optical Beam Collimator) - Allows quick adjustment of beam diameter and intensity Package Contents: Laser Genetics ND-3 Water-resistant Laser Designator Tactical Sight Momentary Pressure Switch Scope mount (1in tube) with windage and elevation adjustments Binocular / Spotting Scope Mount Weaver Mount with dual size mounts (3/8in 5/8in) Carrying Case One Lithium CR123A Battery