Small enough to fit easily in your car's glove box, yet capable of getting you out of big trouble, the ROAV 800A Jump Starter Pro provides peace of mind when you're out on the road. It can jump start gasoline engines up to 6L and diesel engines up to 3L 15 times on a full charge. It can also charge devices such as smartphones through its two USB ports, plus it has an LED flashlight with SOS signal capability and a compass. Built-in safety features protect against reversed polarity, backflushing, low voltage, and overheating. The Jump Starter Pro also works as a diagnostic tool, just attach the clips to your battery terminal for a readout of your battery level.