The National Luna Portable Power Pack is a removable, compact battery box with built-in split-charge isolator that can be used as a standby power pack for 12-volt appliances. This pack is ideal for modern vehicles that cannot accommodate a second battery in the engine compartment. It features fused accessory plugs, a polarized high-power plug, and a built-in battery monitor with low-battery and over-charge warnings. The built-in plugs can be used for low-power accessories such as refrigerators, pumps, compressors, lights, or other 12-volt electronic devices. The high-current input-output can be used for higher power requirements, such as invertors or battery chargers. The built-in split-charge isolator is fully automatic and does not require additional hardware in the application vehicle. You do not need to purchase a separate Cable Kit; it is already included.