In case you are the type who have a stack of old-school NES games lying around, then you might want something to play them on that is portable.

This is where the FC Mobile comes in. The FC Mobile is a thick handheld device that can play NES games. It is powered by 3 AA batteries, and has a 2.4 inch screen. If you want a bigger screen, it can plug into a television via A/V cable.

I believe the only way to get the FC Mobile is through Ebay, and the price ranges for about $30-60 US Dollars.

Source