IO-PCEEJ188-4U is a PCI-Express expansion card that supports 4 SuperSpeed USB3.0 interfaces. It is suitable for your desktop computer USB3.0 interface is not enough, or a computer without USB3.0 interface, through PCI-E The slot expands out of 4 SuperSpeed USB 3.0 interfaces. Features: Fully compliant with the PCI Express Base Specification 2.0 revision. The throughput rate of single-channel (x1) PCI Express is 5 Gbps. Compliant with the Universal Serial Bus 3.0 Specification 1.0 revision. Support for running multiple USB 3.0, USB 2.0 and USB 1.1 devices simultaneously. Supports data transmission rates at the following speeds: low speed (1.5 Mbps) / full speed (12 Mbps) / high speed transmission (480 Mbps) / ultra high speed (5 Gbps). Compliant for Intel's Scalable Host Controller Interface (xHCI) specification 0.96. Supports 4 downstream ports for all speeds. Built-in 4-pin power connector for receiving from an additional power system. Hot plugging allows you to connect/disconnect devices without shutting down the system. Specification: Operating system: For Windows 8 32/64, Windows 7 32/64, Windows Vista 32/64, Windows XP 32/64 Device Requirements: One available PCI Express slot (PCI Express 2.0 recommended) Size: approx. 12 * 7 * 2 cm / 4.72 * 2.76 * 0.79 in Weight: Approx. 96 g / 3.39 oz Package Iist: 1 * PCI-E to USB 3.0 Adapter Card 1 * Drive Disc 1 * English Manual 1、Fully compliant with the PCI Express Base Specification 2.0 revision. 2、The throughput rate of single-channel (x1) PCI Express is 5 Gbps. 3、Compliant with the Universal Serial Bus 3.0 Specification 1.0 revision. 4、Support for running multiple USB 3.0, USB 2.0 and USB 1.1 devices simultaneously. 5、Supports data transmission rates at the following speeds: low speed (1.5 Mbps) / full speed (12 Mbps) / high speed transmission (480 Mbps) / ultra high speed (5 Gbps).