Do you need a reliable RS232 Serial Port on your Laptop? If so, this is the product for you.
This PCI-e based Expresscard uses the Oxford Chipset which is an RS232 Controller.
This is NOT a USB based Serial RS-232 device.
The difference between PCI-e based and USB based Serial RS-232 is, PCI-e based Serial RS-232 is stable! After you set it up, it will not change. For USB based, it may change when you restart your Laptop.