The PCI2S950DV 2 Port Dual Voltage PCI RS232 Serial Adapter Card w/ 16950 UART - lets you add 2 RS-232 serial ports using a PCI expansion slot offering high performance 16950 UART channels/ports for connecting any new or legacy serial peripherals, with data transfer rates of up to 460kbps.A cost-effective solution for connecting serial modems, POS devices, printers, ISDN terminal adapters and more, the PCI serial card offers dual voltage support, allowing you to use a PCI (5V) or PCI-X (3.3V) slot for installation. The RS232 card also provides broad operating system support, IRQ sharing and a plug and play PCI interface with included standard and low profile slot brackets to guarantee convenient, hassle-free serial device connections on almost any system. Backed by a StarTech.com lifetime warranty and free lifetime technical support.