Ade Premium Universal RED Laser boresighter. Ade Advanced Optics RED LASER Boresighter attaches instantly to the muzzle of any firearm and works on all calibers. The magnetic connection to the end of the muzzle provides more precise alignment with the bore without the risk of damaging the bore, compared to arbor style bore devices. A machined aluminum body with soft rubber over-molding houses the laser module. For use on all calibers and firearms. It means .17-.50 caliber rifles, pistols and shotguns. Engineered with a Self Centering arbor. It magnetically attaches to muzzle of any firearm More accurate than arbor type bore sights High power daylight visible green laser Runs on 3x AG13 button batteries (included) Battery life: Approximiately 1 hour Laser Wavelength 632-650nm Output