LASER GENETICS ND-3P SUBZERO DESIGNATOR ILLUMINATOR LIGHT GREEN SPOT MOUNT The ND3-P Laser uses advanced green laser technology to create true night vision. Dimensions: 3.5in L x 2.625in H Construction: Precision Machined High Tech Aluminum Alloy Finish: Anodized Matte Black Wavelength (Color):532nm (green) Range:3 miles Power Supply: One lithium CR123A battery (included) Battery Life: Up to 7 hours, Up to 4 hours at 0F Output Power:15 mW Lens Diameter:26mm Weight:5.37 oz. FDA Safety Class:Class 2M Water Resistant Yes