The LaserLyte Laser Training System will save you money on ammunition and gas spent driving to and from your local range. This unique system is designed to fit all rifles and handguns from 22 to 50 caliber that have at least a 3" barrel. The laser system can be used practically anywhere. It simply shoots the laser downrange and shows you immediately where it hits on the target. The laser is sound activated and will flash momentarily when you dry-fire your firearm. Included in the Laser Training System are batteries, laser, four adjustable adapters for different calibers and instructions for use. Powered by three 377 silver oxide batteries.