The 2-Port Serial PCI Controller Card is a valuable addition for expanding your desktop computer's connectivity options by providing two additional RS-232 serial ports. Each port features a 9-pin DB9 female connector, allowing for the connection of multiple serial devices such as modems, industrial equipment, and serial printers. Capable of data transfer rates up to 115.2 Kbps per port, this card ensures efficient and reliable communication for your peripherals. It is equipped with robust chipsets like the 16550 or 16C550 UART, which enhance stability and performance. The card is compatible with a range of operating systems, including Windows 7, 8, 10, and Linux, with drivers available either on a CD or for download. It is powered through the PCI slot, negating the need for an external power source, and may come in a low-profile design to fit smaller computer cases. Additional features include over-voltage protection to safeguard both the card and connected devices, as well as hardware and software flow control to ensure smooth data transmission. This PCI controller card is an effective solution for users needing to integrate legacy serial devices into their modern systems.