microSD is the format of the removable flash memory cards used in Neo 1973 and Neo Freerunner devices. Additionally the Neo Freerunner support microSDHC.
For more informations about this format see microSD on Wikipedia.
A list of supported cards can be found at Supported microSD cards.
Importent note: Wear-leveling is not part of the SD card specification (version 2.0 SDHC), so please check for yourself that the SD(HC)-card support and use:
Other importent specifications are: