The back seat just caught upcharging is no longer limited to the front seat with the road rockstar designed with a 6ft cable and 4 usb ports you can seamlessly charge 4 devices simultaneously while on the go 2 front seat usb ports charge smartphones at optimum speeds with shared 24a while the extendable hub allows backseat passengers to charge 2 tablets simultaneously at 24a per port perfect for watching movies on long road tripscharge at optimal speedsprovides optimal power to each por