The SL-100 is the perfect tool for the average hunter, providing reliable and accurate Boresighting with minimal hassle. Powered by two button cell batteries (included) that last up to 1 hr of continuous use, the SL-100 uses advanced laser technology to ensure superior accuracy. Its super-strong magnets securely center the laser in the muzzle, delivering consistent and precise alignment. The SL-100 is equipped with a versatile system of adapters and O-rings that fit .22 to .50 caliber handguns and rifles, as well as 20 and 12 Gauge shotguns and muzzleloaders, making it an essential tool for hunters who need quick and reliable setup in the field.