USB 2.0 High Speed (480 mb/sec) Compliant with USB 2.0 and USB 1.1 External power supply required (included) AC Input : 100 - 240V / 50 - 60 Hz DC Output : 5V / 12V Support USB 1.1 on Window 98/98SE/ME/2000/XP and Mac O/S 8.6, 9.x, 10.x, or latest version Support USB 2.0 on Window 98SE/ME/2000/XP and Mac O/S 10.x Package 3.5" Hard Disk Case x 20 USB Cable x 20 Power Adaptor x 20