The StarTech 7 Port PCI USB Card Adapter adds seven USB 2.0 ports, including one internal USB A Female, two internal USB motherboard headers and four external USB A Female to your PCI-capable PC. It is compatible with many operating systems, including Windows 98SE, ME, 2000, XP, Vista and Linux. This USB 2.0 PCI adapter card is a versatile solution to add USB 2.0 connections for external and internal USB 2.0, 1.1, 1.0 peripherals, without having to upgrade the system's motherboard. The PCI USB card supports USB 2.0 device connections for full data transfer speeds of up to 480MBps. This external PCI card adapter is backward compatible with USB 1.1 devices (maximum transfer rate is 12MBps), allowing you to connect any USB device to the computer without having to worry about compatibility issues. This USB 2.0 PCI adapter card is compliant with USB EHCI revision 0.95 and UHCI 1.1 specifications. It can be used with additional USB hubs to add up to 127 USB devices.