I have erfahen until nahhinein is the usb ports just whom is turned on the computer and the hub on the PC hangs due ports are powered even if you connect the supplied charging cable (this can be an advantage or disadvantage ...)
wanted to use namely to eg my mobile phone to charge even if the times without which I would have to look for ne outlet pc not leuft ..... why only 4/5
otherwise there is nothing in it to put out