HN user
And the "digital" versions rely on physics just as much as the versions on discs or cartridges. However, it's abundantly clear what is meant here so there is no need to clarify the language...
The original iPod shuffle was essentially a USB stick with an audio port and some buttons, and I used it in just the same way as this. I think it was only £20 or £30 in price, a great product.
Having bought a second hand copy with no manual, I printed that badboy out at 25% scale (4 pages per double sided sheet), as it was actually needed to go through the tutorials. Took hours and ended up about 2 inches thick.