SIIG 1Ser 16550 DB9 ISA Hi Speed Serial Pro I/O Hi Irq Works with all types of high-speed serial port devices including 56 Kbps modems, label printers, and PDAs Supports Windows 95, 98, and NT and other major operating systems Supports I/O address COM ports 2 to 4 Requires 1 available ISA slot on PC Standard 5-year warranty