It's just an Amstrad CPC 6128 Plus without the floppy port. Many of the systems listed in this topic are actually just 80's european or japanese micro computers crammed into video game console shells.
Here's another one:
A commodore 64 that could only play the cartridge games.
Yet another:
This is basically an atari 800XL in a console shaped box (although, unlike the Amstrad GX4000 or Commodore 64gs, this could pretty easily work as a full Atari 8-bit)
That said, the GX4000 is probably the most hastily thrown together of these kinds of consoles. There are several games that outright still include their keyboard title screens, with impossible to access options. Like, the title will say "Press 3 for sound effects/music", and that option is still in the game, but you can't toggle it because there is no keyboard and thus no 3 key.00
The C64GS is similarly hastily put together, although it has slightly more of an excuse because some of the games released for it were meant only for the normal C64, despite their box advertising. Like, Terminator 2 on the 64gs is advertised as being "64 gs compatible" but it's unplayable on the system for the same reason listed above -- no keyboard, and thus no ability to press 1 to start the game.