ExpressCard providing one port RS232. Where absolute compatibility with classic desktop serial COM ports is a necessity. Guaranteed low latency, memory mapped, no compromise high performance interface. Up to 921,600 data transfer rates and the 256 byte deep transmit and 256 byte receive FIFOS, coupled with 1Mbit/s line drivers deliver uncompromising performance on your laptop. Drivers for Windows 32 bit and 64 bit Operating Systems including Windows XP, Server 2003, Vista, Server 2008 and Windows 7.This high performance range utilizing PCIe native drivers. Excellent method of adding extra serial ports to your laptop.