How to setup RAID

That makes me feel unsure:

The kit includes the A20-OlinuXino-LIME2, a custom metal case with a laser-engraved FreedomBox logo, a high-speed 32GB micro SD card with the FreedomBox software pre-installed, a backup battery, a power adapter, and an ethernet cable.

That’s exactly how I bought the Pioneer-FreedomBox-HSK, so I assume the sd card IS definitely the system disk.
How else would that work?