MicroSD card is needed for slot 1 cart (M3 Real in this case)...The cart itself doesn't have memory, but uses microSD as the storage system..
But I would recommend getting a microSD from some other place, because bundled cards are always overpriced..
And also, if you're buying microSD SDHC (4 GB and bigger), look for the speed class, the higher, the better (the best is class 6)..