LASER GENETICS™ND•3®AR SUBZERO® LASER DESIGNATOR by BSA® OPTICS•Compact •Integrated mount attaches to AR rail •Patented Rotary Optical Collimator uses (9) fully multi-colored lens that allow for full adjustment & control of beam diameter & intensity to focus light where needed most •Features: O-ring seals to keep out water dust & dirt; Nitrogen charged to prevent lens form fogging; Quick adjustable beam (Rotary Optical Beam Collimator) diameter & intensity •Precision machined from high tech aluminum alloy •Anodized matte black finish •Includes ND3®AR Subzero® Laser Designator momentary pressure switch carrying case & (1) Lithium CR123A battery •Wavelength: 531nm (green) •Range: 3 miles •Battery Life: Up to 7 hours (up to 4 hours at 0°F) •Output Power: 15mW •Dimensions: 3.5"L x 2.625"H •Wt.: 5.37 oz. •FDA Safety Class: Class 2M •1-Year Warranty Lens26mm