The Ultimate Alternative to Night Vision! The ND3 Laser Designator is a precision optical lighting instrument using advanced green laser technology. The patented Rotary Optical Collimator allows full adjustment and control of beam diameter and intensity to focus light where you need it most. Rotating the collimator ring to minimum creates a bright micro beam of green laser light visible up to 3 miles. Rotating the collimator to more open settings provides plenty of illumination to light a trail at night or paint a target at up to 250 yards. Battery life allows you to handle any emergency with over 7 hours of continuous use. The ND3 Laser Designator uses patented technology to create true night vision and turns your scoped rifle into a night hunter. Combining a powerful, eye safe green laser diode and a precision optical collimator, the ND3 pairs with your scope and allows you to cast a bright beam of green laser light to fully illuminate targets up to 250 yards. The patented optical collimator allows for quick, one hand, full range adjustment of beam diameter and light strength with just 180 degrees of rotation. You never have to take your eyes off the target or your hand off the trigger. High power green laser light reflects intensely off the eyes of animals allowing quick detection up to 250 yards. The ND3 works well for both night hunting and game spotting. Features: 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 Includes : ND-3 Laser Designator Momentary Pressure Switch Scope mount (1" tube) with windage and elevation adjustments Binocular / Spotting Scope Mount Weaver Mount with dual size mounts (3/8" & 5/8") Carrying Case One Lithium CR123A Battery Specifications: Length: 6.25" x 1.25" dia. (158.75mm x 31.75mm) Battery Life: Up to 7 hours Construction: Precision Machined From High Tech Aluminum Output Power: 18 mW Finish: Anodized Matte Black Lens Diameter: 45mm Tube Size: 1" (adapts to many mounting systems) Weight: 5.5 oz. Wavelength (Color): 532nm (green) FDA Safety Class: 2M Range: 3 miles Water Resistant: Yes Power Supply: One lithium CR123V battery (included) Warranty: 1 Year Limited