This 2 port expresscard based serial card lets you add 2 rs232 serial ports to your laptop or expresscard equipped desktop computer using an available expresscard slot featuring 128 byte fifo communication and a high performance 16c950 uart the expresscard serial adapter card offers up to 1152kbps data transfer rates which ensures peak communication with your serial peripheral devices the serial card is designed based on a single chip architecture as opposed to cards that use a bridge