You can use any micro SD or Micro SDHC cards...
SD cards are 2gb or smaller
SDHC (HC = High Capacity) go up to 32gb
Anything over that is SDXC (Xtra capacity) and these start at 64gb, but only a few of the newer cameras and newer computers (mainly macs at the moment) can read these... The M&M unit can NOT read SDXC