The Pink Rhino Laser Training Cartridge provides instant laser activation when the trigger is pulled. Train with your firearm using most visible laser target systems or simulations. Laser cartridges are rimless allowing the action to cycle without extraction*. Select the appropriate caliber for your firearm. 12 gauge laser cartridge requires LR44 batteries (included). All other calibers require three LR626 batteries (included). Bright red Class 3A (<5mW) laser cartridge 630 - 670nm *The exceptions being 12 gauge (which is partially rimmed, and may extract) and revolver laser cartridges (which are rimmed and will extract). Note: To prevent damage to the o-rings, a very thin coat of oil should be applied to each o-ring. Reapply as needed. Accelerated End-Cap Wear: CZ Shadow 2, HK CC9, Sig P365, S&W Shield X, Hellcat Incompatible with: Girsan, Hi Point, Laugo Alien, Ruger (SR series, 9E, LCP, LCR), Tanfoglio, Walther CCP, AR-15 pattern firearm, Phoenix Important Note: May not work in firearms with a loaded chamber indicator near 12 o’clock (e.g., Ruger SR series).