Koutech 5 Port USB 2.0 PCI (3xExternal+2xInternal) with Both Regular and Low-Profile Brackets Five (5) High-Speed USB 2.0 ports Three (3) external ports Two (2) internal ports PCI specification v.2.2 compliant USB Specification v.1.0/1.1/2.0 compatible (data transfer rate at 1.5/12/480 Mbps)