SYBA PCI-Express USB 2.0 5 Ports Controller Card Model SD-PEX-NEC5U Type: PCI Express to USB Card External USB Ports: 4x USB Ports Internal USB Ports: 1x USB Port Standard: USB 2.0 Data Transfer Rate: 480/12/1.5 Mbps Operating Systems Supported: Microsoft Windows 98SE/ME/2000/XP/2003 Server/XP 64-bit Compatibility: Supports up to 127 devices per port Specifications: NEC 720101 Chipset 1-Lane (x1) PCI-Express with transfer rate 2.5Gb/s full duplex channel 5x Ports Adaptor includes 4x External + 1x Internal Ports (shared with first external port) USB 2.0 EHCI and USB 1.1 OHCI compliant Compliant with PCI-Express Revision 1.0a Backward compatible with USB 1.1 devices Over current protection, each port 500mA Simultaneous operation of multiple high-performance devices Fully plug & play and hot swapping supported