It looks a bit like the retro Game Boy, but it is so much more. The Clockwork GameShell is a pretty stacked little system with a Quad-core Cortex-A7 CPU, a Mali GPU, a micro HDMI port, and MicroSD for storage. Because of the micro HDMI port, you can play on a larger screen if that is your thing.
Allowing users to play retro games from Atari, GB, GBA, NES, MAME, MD, PS1, and various other historic consoles. Each GameShell device comes with pre-installed the Cave Story, Freedom and indie games.