5 Ports: The PCI expansion card to USB adapter hub provides 4 external USB 2.0 ports and 1 shared internal port for independent transfers and high-speed operation. 480Mbps: The USB 2.0 5-port expansion card supports transfer speeds up to 480Mbps. It's backward compatible with USB 1.0, 1.1 devices (1.5Mbps for USB 1.0, 12Mbps for USB 1.1). Connect up to 4 additional USB 1.0, 1.1, 2.0 peripherals to your computer simultaneously. Plug and Play: Supports plug and play, hot swapping, and no need to shut down the computer before disconnecting the connected device. Support System: Supports Windows 98SE, ME, 2000, XP, NT 4.0, XP 64-Bit, Vista, Linux, OS X. Scope of Application: The PCI to USB 2.0 expansion card can support connecting up to 127 USB devices, with each USB interface suitable for connecting USB mobile hard drives, USB mice, scanners, keyboards, digital cameras, and other USB devices.