The MagnetoSpeed RifleKuhl Barrel Cooler is designed to cool your barrel down faster, so you don't have to wait. It is powered by a CR123A Lithium battery (included) that pushes filtered air down your barrel to cool it at a faster rate. The MagnetoSpeed RifleKuhl Barrel Cooler pushes air through the bore of the barrel at a rate that will typically cool the barrel in under 7 minutes. Riflekuhl doubles as a chamber flag and features an exclusive built-in air filter to prevent dust and dirt from being blown into your rifle.