Like New Laser Genetics Model number LG-ND3X40-SZ Sub Zero 30mW Green Laser Designator with Pressure Switch, 1″ Scope Mount, Tripod Mount, 3/8″ Dovetail Ring. The ND3X40 Sub Zero laser designator is 65% brighter than the original ND-3 and with advanced green laser technology. The patented Rotary Optical Collimator uses 9 fully multi-coated lenses that let you control the beam diameter and intensity. This unit has a 3-mile visibility, 7 hour battery life, Nitrogen charged, and O-Ring sealed. Your hunting rifle can be the ultimate night vision predator gun at the push of a button.