"The Retro Duo is a video game console developed by Retro-Bit and distributed by Innex, Inc. The Retro Duo is an 8-bit and 16-bit video game console. It was designed as an emulator to fit the needs of 8-bit and 16-bit console gamers and plays game cartridges for the Nintendo Entertainment System and Super NES/Super Famicom. There have been quite a few clone systems made in recent years, but the difference with this one is that it plays American, European, and Japanese games and has the highest compatibility over any other clone system. Another notable difference is that S-video is now compatible when playing SNES games and it makes the games look noticeably better. The console is not licensed by Nintendo and is not fully compatible with every game released for the two game systems, however the majority of games will function properly. While it has only been released in Canada and the United States, it can still be used in Europe and Japan with a power plug adapter. The console is compatible with official and third party SNES controllers. The console can be purchased on many online stores, such as ThinkGeek.
Reviews of the Retro Duo have praised its compatibility for games many other clone consoles struggle with (due to hardware issues) such as Castlevania III: Dracula's Curse on the NES, Star Fox on the SNES, and the Game Genie cheat cartridge. The Retro Duo is also compatible with the Super Game Boy device. The Retro Duo was released in 4 different color schemes; White/blue, silver/black, black/red, and a red/gold limited edition version."
Source: Wikipedia, "Retro Duo," available under the CC-BY-SA License.