2 RS232 Serial port & 1 Parallel Port allow to connect more devices to your computer. PCI specification revision 2.2 compliant with 33Mhz & 32-bit data. Standard RS-232 DB9 male serial port compliant. Standard IEEE 1284 DB25 female parallel port compliant. Supports up to 1.5 Mbytes/sec transfer rate. (parallel port) Supports up to 1Mbytes/sec transfer rate. (serial port) Automatically selects IRQ and I/O address. Supports PCI IRQ sharing to save valuable resources for other I/O expansion cards. Supports PCI-bus power management interface. Supports hot swap and wake-up. Operating System: Windows 98, ME, 2000, 2003, XP & Vista. Package content: 1X Brand New 2 RS232 Serial Port & 1 Parallel Port PCI Card. 1X CD Driver.