Aluminium USB 4 Port HUB Support USB2.0 and 1.1,Transfer Rate Up to 480Mbps,Middle speed:12Mbps,Low speed1.5Mbps Aluminium USB 4 Port HUB Support USB2.0 and 1.1,Transfer Rate Up to 480Mbps,Middle speed:12Mbps,Low speed1.5Mbps Win95/osR2/98SE/Me/2000/XP,Linux2.4and Mac os8.5