Hama usb 20 hub 14 bus powered for connecting up to 4 usb devices eg mouse keyboard printer external hard drive to a single usb port bus powered voltage is supplied via the usb socket from a pcnotebook integrated usb cable top side socket for added simplicity and convenience when plugging in devices greater distance between sockets makes it easier to plug in wide usb plugsdongles suitable and tested for usb 20 though also backward compatible with usb 11 data transfer rate