Syba 2 Port DB9 Serial 34mm Express Card - SD-PCM15009 Support up to two RS232 serial ports Compliant with 32-bit Cardbus PC Card Type II standard. Supports serial data transfer rate of up to 1Mbps. Supports 5-, 6-. 8-bit data framing 16-byte receive and transmit FIFO to reduce CPU overhead Supports Windows 2000, Server 2003, XP, & Vista OS. System Requirement: Hardware: notebook computer with PCMCIA slot