This professional and powerful 12V jump starter from Schumacher is designed for trouble-free starting of cars and commercial vehicles. It is equipped with a main switch for spark-free connection to the vehicle battery. The digital display shows the voltage of the internal batteries and the vehicle. There is a USB port for charging mobile devices and a 12V outlet which is also used for memory saver mode. The unit is equipped with a reverse polarity alarm, anti-spiking, and a 300A in-line fuse to protect against excessive current output. There are heavy-duty curved clamps for easy and optimal battery terminal connection. For extra durability, this unit has a robust case with protective rubber bumpers for shockproofing.