The 4-Port USB Car Charger is an ideal solution for charging mobile devices while on long road trips or short commutes. This high-performance car charger features a sharable, compact design for easy portability and provides a power output of 5V and 5.8A for device charging.The charger includes three USB-A ports on the passenger extension and one USB-A port on the DC adapter to charge four devices at once. The charger measures voltage and automatically adjusts power outputs. Having the ability to detect the accurate current output allows for protection against overloads, which can damage valuable mobile devices.5 volts and 5.8 amps of power are available for device charging from this adapter when it is plugged into a DC outlet. The 5.8 amps are broken down by 2.4 amps for port one and a shared 2.4 amps between ports two and three on the passenger extension, while the DC adapter has a 1 amp port. The power output makes this adapter the perfect solution for charging smartphones and tablets.