The EC4S952 4-Port Express Card-based Serial Card lets you add four RS232 serial ports to your laptop or Express Card equipped desktop computer, using an available Express Card slot. The Express Card Serial adapter 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, as well as reduced power consumption & CPU load reduction of up to 48%. Compatible with Express Card 34mm & Express Card 54mm card slots, the 4 Port Serial Express Card
Includes:: a slot spacer for greater stability while installed in 54mm slots.