So indeed, if you need to manage Mitras LX at a distance of more than 30m from other Mitras LX, having a card in each Expansion Box makes sense, but I admit I have never tested if it works technically, even if logic dictates that it should work and that the 2 cards therefore broadcast the same schedule. On the other hand I have the impression that until now your cards are useless if on the 2 places there is a master Mitras. Again this has nothing to do with wifi even if the frequencies are close. I let Vinny answer.