2 Port USB 3.0 USB3.0 PCI-E PCI Express Card Adapter + 2 Port USB 3.0 5.25" Front Panel Bay Mounting Bracket w Motherboard 20 Pin Header Cable & Low Profile Bracket, Renesas D720201 Chipset Connects up to 4 external USB 3.0 devices to you computer easily. 2 port USB 3.0 5.25" front panel bay mounting w/ motherboard 20P header available. Low-profile bracket available for small computer & server case, like 1U & 2U. Stable and reliable NEC Chipset Renesas D720201. Front panel specification: 5.25".