Here are some useful accessories brought to you by Enter. The highly-functional 4 and 7 port USB hub serial cards and host cards will make your working experience better than before. Be quick in picking the one you need and comfortably suffice your daily computer related works.Key Features:PCI specification revision 2.1 compliantCompatible with standard 16C550 UART with 16 byte transmit-receive FIFOFast data rates up to 1 Mbytes/secDB9 serial port connector x 1Pin header serial port connector x 1