This is a Class 4 microSD card with 16GB of space. On it we will install the default bootable Debian Linux build for the Arietta-128MB and Arietta-256MB embedded Linux boards.
The software is the same freely available package you can download from the Arietta board pages. What you purchase from this page is technically the microSD card itself; the software is open-source (i.e. free), only installed for you as a courtesy to save you time versus having to install it yourself.
Once you insert the card into your Arietta board and boot it up, log in as root with password acmesystems.
If you have your own blank microSD card available already, you can install the software yourself without having to purchase anything. See the Arietta G25 SoM Resources section of the Arietta board pages and download the Arietta G25 kernel and rootfs partitions and the Instructions for Creating a Bootable microSD Card.