The side mounted SD card slot is a
huge advantage over another similar 'box' that uses a MicroSD card with their access slot at the
bottom of the
rear panel which (on both counts) makes it unnecessary hard to find and insert or remove. Between that microscopic paper thin card and it's location, one would be pressed to make it any harder to use.
As far as use, it can expand internal storage.
Good post
SSThing, this saves others from a hassle.