Laser collimator with a stainless steel and brass cartridge, easy to use. Automatic activation by closing the shutter, calibration distance from 25 meters to 500 meters. Powered by three type 393 batteries included. Output power less than 1 mW, class 2 in accordance with CEI EN 60825, available for sale. It is important not to shoot with the laser inserted in the barrel. Gross weight: 185 grams.