StarTech.com 4 Port Native ExpressCard RS232 Serial Adapter Card with 16C950 UART EC4S952 A simple and portable way to add serial ports to your laptop; with the included flexible dongle, the card can easily be transported in any laptop bag Compatible with every style of ExpressCard slot; both 34mm and 54mm sizes. Includes a slot spacer for a perfect fitment in 54mm slots Single chip design provides optimized speed, reliability, and power while reducing CPU load by as much as 48% Compatible with ExpressCard 34mm and 54mm form factors (with included adapter) 128-byte deep transmit/receive FIFOs Automated in &amp; out-of-band flow control Fully compliant with Express Card 1.1 Specifications Single chip design optimizes speed, reliability and power