This is an OG Steam Deck with LCD screen that has been upgraded with 2TB of internal storage, as well as a 1TB MicroSD card that is used to dual boot into a custom emulation platform specifically for the Steam Deck. It also has a tempered glass screen protector installed.
This is what is on the MicroSD:
https://www.arcadepunks.com/fully-loaded-1tb-steam-deck-pc-batocera-build-v2-from-q-le/
Obviously you can wipe it and use it for additional storage if you wanted, as well.
Also comes with original carrying case, as well as official Steam dock and charger.