Laser Genetics ND-3P Subzero Self Defense Laser Designator with AR/M4 Mount: * Operates in temperatures as low as 0 degrees F * Uses patented technology to create true night vision * Combines a powerful, green laser diode and a precision optical collimator * Fully illuminates targets up to 250 yds away * Patented Rotary Optical Collimator uses a system of 9 fully multi-coated lenses that allow full adjustment and control of the 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 away * Rotating the collimator to a wider setting creates a light source when hiking or following a trail * Machined from a high-tech aluminum alloy * Anodized black finish * Features O-ring seals to keep out water, dust and dirt * Nitrogen-charged to prevent lens from fogging * Extended battery life allows you to handle any emergency with over 7 hours of continuous use (3 hours of continuous use at 0 degrees F) * 1 lithium CR123A battery, included * Dimensions: 12"L x 5.65"W x 4"H * Imported * 1-year manufacturer"s warranty * Model# LASLGND3ARSZ