Product Detail Guaranteed compatibility with any PC running Windows®, DOS® or Linux® Data transfer rates of up to 920 Kbits/sec for peak serial device performance Easy to install and use with full step-by-step instructions Includes extra screws and two opposing IO brackets ensuring a fit in different system configuration Hot-swapping, dynamic reconfiguring of up to 63 devices on the bus . The "2port 16c550 Lp-pci Serial Card" is best product for you. We recommended 2port 16c550 Lp-pci Serial Card