This is one awesome mod.  It’s a Nintendo Entertainment System ROM player built into an NES game cartridge.  Apparently “it’s just a generic Chinese media player that can play NES, Gameboy, and Gameboy Color ROMs, along with the relevant controller bits, a 2.8-inch LCD, 4GB of storage, and a rechargeable battery.”  You can also hook it up to a TV to play that way.  Go back in time you nostalgic dreamers with the video above.

[Via Engadget]