Docooler SuperSpeed 2-Port USB 3.0 PCI-E PCI Express 19-pin USB3.0 15-pin SATA Connector Low Profile Extend with 2 USB 3.0 downstream ports and 1 USB3.0 19-pin Connector(can expand another two USB 3.0 ports) for standard desktop PC. Fully compliant with one-lane (x1) PCI Express 2.0 specification. TWO external 5Gbps SuperSpeed USB 3.0 ports. One 19-pin internal 5Gbps SuperSpeed USB 3.0 port. Built-in with 15-pin SATA Power Connector for added power source to better support power hungry bus-powered devices.