Product Detail Best Connectivity RS-232 Serial Port ExpressCard/34 mm General Features: Compliant with ExpressCard/34 mm Type II standard Supports Standard RS-232 Serial interface DB9 to Serial port cable included Prolific PL2303 chipset Compatible to USB 2.0 Full Speed (12 MHz) throughput Support Software/Hardware RS-232 flow control Software programmable baud rate up to 3 Mbps . The "Syba SD-EXPC34-1S 34mm 1x DB9 RS-232 Port Serial ExpressCard" is best product for you. We recommended Syba SD-EXPC34-1S 34mm 1x DB9 RS-232 Port Serial ExpressCard