Koutech Single Port SuperSpeed USB 3.0 ExpressCard Recessed with Full Power Fully compliant with ExpressCard 1.x specifications using the latest PCMCIA ExpressCard/34 interface Due to expresscard limitations, 5Gbps port will max out at 2.5Gbps One (1) external 2.5Gbps SuperSpeed USB 3.0 port that complies with Intel eXtensible Host Controller Interface (xHCI) and original USB devices ExpressCard/34 module (34 mm wide) can fit into either a Universal or 34 mm ExpressCard slot Fully Plug-N-Play and Hot-Swap compatible and supports Windows XP/Server 2003/Vista/Server 2008/Windows 7/Windows 8