Tendak Superspeed PCI-E to USB 3.0 4 Ports Express Card USB 3.0 HUB Controller Adapter with 15-Pin SATA Power Connector for Desktops PC 4 USB 3.0 downstream ports for standard desktop PCs; Supports USB Hot Plug, Plug & Play; Support LPM, Low Energy Consumption; 15 pin SATA Power Connector to power USB devices from your PC power supply SuperSpeed USB 3.0 supports transfer rates of up to 5Gbps - The actual transmission speed is limited by the setting of the device connected With quick and easy installation, Enjoy copying videos, music, photos, data files between USB devices and the computer at blazing fast speeds Each USB Port supplies maximum +5V/900ma power output to USB device Backwards compatible with USB 2.0 and 1.1 devices; Compatible with Windows XP/Vista/7/8