2 Ports USB 3.0 Back Panel to MB 20pin Header Connector Cable Adapter 1.5 Feet Come with PCI Slot Plate Bracket If You Have an Extra Internal on-board USB 3.0 Port and Want to Create Two More External USB Ports on the Back of Your Computer, This Cable will meet Add USB ports without having to take up any PCI slots Connectors: USB 3.0 Female (x2), 20 pin USB 3.0 Motherboard Connector Header Cable Length: 50cm / 1.5Feet, Long enough for most PC Case Easy to install, plug and play, no additional drivers needed