USB2.0 Specification compliant, backward compatible with USB1.1. Compliant with Open Host Controller Interface Specification for USB Rev. 1.0a. Compliant with Enhanced Host Controller Interface Specification for USB Rev. 0.95. PCI multi-function device consists of two OHCI Host Controller cores for full/low-speed signaling and one EHCI Host Controller cores for high speed signaling. 7 external USB2.0 ports. Supports Both Full-Speed and Low-Speed. Supports up to 127 devices. USB2.0 data transfer rate up to 480Mbps. External power supply. Plug and play installation. Supports PC Windows 98/98SE/ME/2000/XP/Vista/7, Mac OS 9.2 or higher, Mac X 10.1 or higher.