TOOGOO(R) SuperSpeed 2-Port USB 3.0 PCI-E PCI Express 19-pin USB3.0 4-pin IDE 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. SuperSpeed USB 3.0 is fully compatible with original USB system, peripherals and cables.Ideal connection for digital cameras, scanners, printers, external CD/DVD/Blu-Ray writers, hard disk drives, flash memory drives and etc. Fully Plug-N-Play and Hot Swap compatible. 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 4-pin IDE Power Connector for added power source to better support power hungry bus-powered devices. SuperSpeed USB 3.0 offers 10 times performance increase over Hi-Speed USB 2.0. USB 3.0 complies with Intel eXtensible Host Controller Interface (xHCI). Up to 5Gbps maximum transfer rate. SuperSpeed USB 3.0 is backwards compatible with USB 1.0/1.1/2.0 devices (data transfer rate at 1.5/12/480Mbps). Supports PCI Low profile.