One upstream and three downstream USB portsSupports both full-duplex and half-duplex operationsComplies with USB 2.0 and 1.1 specificationsSupports auto connection and speed detectionSupports plug-n-play installation and hot plugging capabilitySupports bus-powered and self-powered modesCompatible with Microsoft Windows 2000 2003 XP Vista 7 and Mac OS 10.3 10.4 10.5 or above