what is the biggest microsd card i can put in this thing.
What do the 'classes' mean? which class is recommended?
32GB
The classes refer to the speed the card can read & write date.
The greater the class the greater the speed.
Classes start at 2, then 4, 6, 8 & 10.
However not all manufacturers class rating is equal in speed.
i.e. A Sandisk Class 2 is greater in speed to a Kingston Class 4.
My favorite card is the Sandisk 32GB Class 4.