http://hexus.net/gaming/news/hardwar...-fits-keyring/

Retro gaming is popular with a large audience, as the success of Nintendo?s own NES Mini and SNES Mini consoles confirms. Now there?s another retro console maker hoping to cash-in on the retro wave with a product called PocketSprite. As the name indicates, this is a compact device, actually it is much smaller than traditional handheld consoles. However, it is claimed to be ?ultraplayable,? and provides ?instant access to gaming classics,? because you can carry it around anywhere on your keyring, for example.

I think it is good to consider the console size first. What is the sizing sweet spot between great portability - and having comfortable controls with an acceptable screen to view? TeamPocket, the makers of PocketSprite, reckon it is 55 x 32 x 14mm. This might loosely be described as matchbox or tic-tac box sized. For another comparison a regular business card or credit card is 55 x 85mm, so if you fold it in half its front surface area is still more expansive than the PocketSprite.