Brand new 2 port RS232 PCI I/O Expansion Card. PCI specification revision 2.1 compliant w/ 33Mhz & 32-bit data. Standard RS-232 DB 9pin male serial port compliant. Supports up to 1Mbytes/sec transfer rate. 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, 7 & 8. Package content: 1X Brand New 2 Port RS-232 PCI Card. 1X CD Driver.