This professional and powerful 12V jump starter from Schumacher is designed for trouble-free starting of cars, commercial vehicles and trucks. It is equipped with a main switch for spark-free connection to the vehicle battery. There are two batteries providing up to 1,800CA in 12V and 900CA in 24V. 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 500A 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.