OFFERS FOUR SUPERSPEED USB 2.0 TYPE A DOWNSTREAM PORTS . CAN BE INSTALLED IN A FREE TYPE 3.5 OR TYPE 5.25 (BY USING THE OPTIONAL 5.25 MOUNTING RACK) DEVICE BAY . LED STATUS INDICATOR FOR EACH PORT . 4-PIN HDD POWER CONNECTOR TO SUPPLY UP TO 900 MA ON EACH PORT . SUPPORTED OPERATING SYSTEMS: WINDOWS XP/VISTA/7 . CONTENTS: USB HUB, USB CABLE, POWER CABLE (4-PIN HDD M-F), TYPE 5.25 FRAME