The SIIG CyberSerial 4S 550 PCI 4-Port RS-232 Controller IO Card (JJ-P45012-S6) is a port expansion card designed to add four serial (RS-232) ports to a computer. It is compatible with 3M and Acer Aspire products, with a maximum data rate of 9.6 KBps and standards set at Bell 103. This PC Card (PCMCIA) Type I unit includes a manufacturer warranty and is made in China. The card is ideal for expanding the number of serial ports on a computer for connectivity purposes.