Add 4 RS232 serial ports to your PC, through a single PCI expansion slot. The PCI4S550 4-Port PCI RS232 Serial Adapter Card (16550 UART) adds four RS232 serial ports, using a single PCI slot - a cost-effective solution for connecting any new or legacy serial device, with data transfer rates of up to 115.2 Kbps.A versatile serial solution, the PCI serial card lets you add 4 ports using only a single standard profile PCI slot on the system. The included breakout cable separates the ports to avoid cluttered connections.Perfect for connecting serial modems, POS devices, PDAs, digital cameras, printers, ISDN terminal adapters and more to your system, the adapter card supports IRQ sharing and operates flawlessly in Windows(r) and Linux(r) environments.Backed by a StarTech.com lifetime warranty and free lifetime technical support.