Features 4 external USB 3.0 SuperSpeed ports Expands your computer via the PCI Express slot with 4 x USB 3.0 port Supports USB 3.0, USB 2.0 and USB 1.1 Data transmission: SuperSpeed (5Gbps), High Speed (480Mbps), Full Speed (12Mbps) and Low Speed (1.5 Mbps) Easily add four additional USB 3.0 ports to your computer with this PCI Express card. This card is the simplest and most cost effective way to permanently add four 5Gbit/sec external USB 3.0 ports to your computer.