Adds five USB 2.0 hi-speed ports to your computer (four external, one internal). Backward compatible with USB 1.1 devices. Supports up to 127 hi-speed devices and 254 full-speed ports. Plug-and-play installation. Requires Pentium Class PC with available PCI slot, Windows® OS with USB 2.0 support. Compatible with Windows® 98 SE, 2000, Me and XP; Powermac® computer running OS 10.2.7 or above.