Features and Benefits:Plugs into vehicle's 12V DC outletCharges all M18™ & M12™ batteriesReduces time to manage charge cycles by automatically charging the second inserted pack once the first pack is fully chargedCharger monitors the voltage of the vehicle battery and will automatically shut down if the vehicle battery voltage dips too low in order to prevent excessive dischargeCharger communicates with the battery pack to ensure a full charge and battery protectionBatteries NOT IncludedCharge On The Go. The M18™ & M12™ Vehicle Charger allows users to charge battery packs on the go from the DC Outlet of any vehicle. The charger provides full system compatibility and accepts all M18™ and M12™ batteries. Featuring REDLINK™ Intelligence, it communicates directly with the battery to monitor cell voltage, temperature, and charge status to optimize the performance and extend the life of the pack. As an added level of communication, the charger has protective electronics that automatically shut down the charger to prevent excessive discharge of the vehicle battery.Batteries NOT Included.