The SL-150 is the perfect choice for hunters and avid shooters seeking enhanced laser power and extended battery life. Featuring an ultra-bright red laser, it is powered by a single CR2 lithium battery (included), offering up to 40 hr of continuous use. Using the latest in laser technology, the SL-150 delivers superior Boresighting accuracy, with super-strong magnets in the arbor that securely center the laser in the muzzle for consistent and precise alignment. Its versatile system of adapters and O-rings fits .22 to .50 caliber handguns and rifles, as well as 20 and 12 Gauge shotguns and muzzleloaders, making it an excellent all-in-one solution for a wide range of firearms.