4 USB power ports charge 4 mobile devices simultaneously, provide one USB QC3.0 quick charge, one output 5V/3.1A, and another two total 5V/2.4A. Support QC3.0 quick charger, help your device charge quickly. With a clip it is very convenient to hang the adaptor behind the seat. 4 USB port can be charged at the same time, it can support various mobile terminal used in the car, like mobile phone, for iPad, for PSP, eBook, GPS, cameras, etc. Come with 1.7m / 5.6″ long cord, convenient for people sit on the back seat to charge and use their phone at the same time when driving. Support DC 12V-24V voltage input, applicable to most cars, trucks, etc. Built-in short-circuit protection, overload protection, overvoltage protection, overheating protection.