Just double-checking Trash... you're not thinking that this dongle would be somehow useful in interfacing some other USB device to an old Mac, are you? (Remember the power tool + accessories analogy: A USB peripheral is *not* a USB host.) Hiding one in a Duo would be of somewhat limited utility unless you wanted to, I dunno, keep it in there with one of those snap-retract USB cables so you'll always be ready for a null modem session with another Mac.