UTG Combat Tactical W/E Adjustable Red Laser with Rings Smart spherical structure achieves simplified, strengthened inner and outer tube interaction for precise and responsive adjustment Universal integrated mounting deck allows you to install on military standard Picatinny and Weaver rails 2.64-inch length and 0.55-inch diameter; one-ounce weight, including battery; 15-to-20-millimeter beam diameter at 15 meters; 80-minute operating time Class 3R Red Laser with the output of 2.5~3.1mW