This 1 Port Serial Express Card Adapter lets you add an RS232 serial port to your laptop or Express Card-equipped desktop computer. The serial Express Card is designed based on a single-chip architecture (as opposed to cards that use a "bridge chip"), providing native PCI Express communication for greater performance & reliability, & reduced power consumption & CPU load. An included 34mm to 54mm Express Card stabilizer adapter bracket allows the EC2S952 to fit in both 34mm & 54mm Express Card slots. This serial adapter features 128-byte FIFO communication & a high performance 16C950 UART. Providing optimal communication with RS232 serial devices, the serial Express Card supports data transfer rates of up to 460 Kbps, saving time & hassle.