Suddenly I had problems with my Mac AirPort connection (10.6) that began to disconnect for unknown reasons inadvertently. After scouring the forums and found no internal solution, I followed the advice of a guy and I bought this little key that I plugged into the last available USB port on my Mac. Once the new set-up network, departed nickel ... and even better than before I am 100% WiFi all the time whereas before, with AirPort, I navigated between 30 and 65%. I recommend!
