The 4-Port PCI Express RS232 Serial Adapter Card allows you to add four RS232 (DB9) serial ports to your computer through a PCI Express slot. It enables interaction with serial devices such as card readers, printers, PIN pads, and modems at speeds up to 921.6Kbps per port. The card offers configurable power output on Pin 9 when external power is connected, with each port individually configurable. It comes with a pre-installed low-profile bracket and includes an optional full-profile bracket for versatile installation. The card is compatible with Windows XP and later versions, as well as Linux, and features the Asix AX99100 chipset, complying with PCI Express 1.1 standards.