Hama onoff switch usb 20 hub 14 for connecting up to 4 usb devices eg mouse keyboard printer external hard drive to a single usb port bus powered ie the voltage is supplied via the usb socket on a pcnotebook integrated usb cable separate onoff switch allows energy saving led function indicator gives information about the connection status of usb devices top side socket allows you to plug usb devices in on the top for added simplicity and convenience suitable and tested for