With an output of 5V/4.5A with four USB ports, you can fast charge up to four of your devices at the same time. When charging multiple devices together the voltage is evenly distributed over all the powered ports. The maximum power output of a USB port is 2.4 A. Compact and lightweight, the USB Smart Charger will become an integral part of your travel essentials. It is reliable, has a long life and the input of 100-240 V AC guarantees it can be used almost anywhere.