Add 2 RS-232 DB9 serial ports to your full height or low profile computer through a PCI Express X1 slot with IOCrest SI-PEX15037 PCI-Express X2 serial controller card. The RS232 serial adapter card is compatible with a broad range of operating systems, including Windows and Linux (kernel 2.6.11 and up). plus, the adapter card includes an optional half-height/low profile bracket that allows the card to be installed in virtually any computer case.