We've seen many revisions of the Game Boy hardware over the years, but the Visteon Dockable Entertainment System has to rank as one of the most obscure. Produced in 2006 under licence from Nintendo, this portable DVD player was designed to make those long car trips a little more enjoyable, but had the added bonus of playing Game Boy Advance cartridges. It even came with its own (rather odd-looking) joypad.
The system has faded into obscurity over the years and is now very rare, but those resourceful chaps over at My Life in Gaming have gotten their hands on one and have been putting it through its paces to see if it's worth seeking out should you be looking for the best way to play GBA games.
To cut a long story short, it's probably not worth the effort - but this nevertheless remains a fascinating off-shoot of the Game Boy line, and by far and away the largest portable version of the system.