1、4 Ports: A USB expansion card upgrades your desktop computer to 4 USB 2.0 ports via a PCI Express x1 slot. Solve the problem of less USB ports inside the computer host, allow to connect more USB data devices to your computer system, large 4pin power supply. 2、Transmission Speed: PCI E to USB expansion card complies with USB 2.0 specification and OHCI protocol, low speed (1.5Mbps)/full speed (12Mbps) and EHCI protocol, high speed (480Mbps). 3、Wide Compatibility: Internal USB Hub is compatible with for Win 7/8/10/,for Linux and for OS X operating systems, suitable for PCI Express x1 to x16 slots. 4、Support Hot Plug: 4 Ports PCI E to USB Hub plug and play, the device supports hot plug, easy to use. 5、Wide Application: The USB expansion card adapter can be used with various USB devices on the market, such as printers,card readers, cameras, scanners, etc. Item Type: PCI E to USB Expansion Card Hub Product Material: PCB Interface: 4 x USB2.0 Applicable Slot: PCI E Main Chip: ASIX MCS9990 Feature: Compliant with PCI Express Specification Version 1.1, Bus Bandwidth 2.5gbps Compliant with USB Specification Version 2.0 Compliant with USB EHCI Interface Protocol Version 1.0A Compliant with USB EHCI Interface Protocol Version 1.0 External Power Connector Provides More Power to the USB Bus 1 x PCI E to USB Expansion Card Hub 1 x Metal Baffle 1 x Wire Harness