ContourROAM2
You can use any* microSDHC card up to 32GB in size between Class 2 and Class 10 in speed.  Be sure that you format microSD cards using the in-camera method  for this model of camera.

ContourGPS, Contour+, ContourROAM, and Contour+2
You can use any* microSD or microSDHC card up to 32GB in size and up to Class 10 in speed.  Be sure that you format microSD cards using the in-camera method  for each of these models of camera.

ContourHD 1080p
You can use up to a 32GB card in your ContourHD 1080p.  When that camera  was first introduced, 32GB cards were not widely available and that is why the printed manual in the box references 16GB cards.  Since then the microSD card market has expanded and so your camera can use a 32GB card.

 

However, because the camera was not designed to use a card of that size, the memory card light will alway indicate that the card is full by showing a red light anytime you check the card status.  This is true even when the card is not full.  Other than that, it will function normally.

ContourHD 720p
You can use up to a 16GB card in your ContourHD 720p.

*SanDisk Ultra cards are ONLY compatible with the ContourROAM, ContourROAM2 and Contour+2 cameras using the latest firmware.