This Universal PCI card provides 2 industry standard 9-pin COM ports, 1 RS422/485 and 1 RS232, in a single PCI slot. On board Zener diodes ensure electrical protection. Velocity megabaud data transfer rates and 128 byte deep FIFO guarantees uncompromising performance and fault free use. Universal PCI is fully compatible with both 3.3Volt and 5Volt PCI slots, protecting your investment into the future.