The Sightmark Professional Universal Green Laser Boresight is designed for sighting in .17-.50 caliber rifles, shotguns and pistols. The unit provides the fastest gun zeroing and sighting system to reduce wasted cartridges and shells when sighting in your new optic. Its durable, ultra-compact design makes it easy to pack for travel, and includes an ultra strong magnetic base that is expanded to fit shotguns and muzzle brakes. The boresight features digital on/off and mode controls and long lasting battery life using CR123A batteries. Package Includes CR123A Batteries Features Easy to pack and travel CR123A battery powered Retractable arbor automatically adapts boresight to any caliber barrel Reduce wasted cartridges and shells Durable and reliable Compact design Digital switch on/off and mode controls Ultra strong magnetic base, expanded to fit shotguns and muzzle brakes Fastest gun zeroing and sighting system Specifications Compatible Calibers .17 Caliber .50 Caliber Rifles and Up to 12 Gauge Laser Wavelength 532nm Output Power 5 mW Battery Type CR123A Battery Life Continuous 12 Hours and Strobe 30 Hours Range For Sighting 15-100 Yards Dot Size at 100 Yards 2 Operation On/Off and Strobe Mode Construction Aluminum, Rubber, and ABS Plastic Operating temperature, F/C 15 to 122 Length 3.32 Width 1.26 Height 2.20 Weight 5.30 oz SOLD QUANTITY 1