This 1 port serial expresscard adapter lets you add an rs232 serial port to your laptop or expresscard equipped desktop computer the serial expresscard 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 and reliability and reduced power consumption and cpu load an included 34mm to 54mm expresscard stabilizer adapter bracket allows the ec2s952 to fit in both 34mm and 54mm expre