From Sega Retro
The RetroN 3 is a clone console manufactured by Hyperkin, which first appeared on the market in 2009. Taking advantage of expired patents, it combines an NES, an SNES, and a Sega Mega Drive console into a single unit. It followed the RetroN 1 (a NES clone) and the C2 gaming system (a NES/SNES clone). It currently retails for $69.99 in North America, and is available in red and black variations.
Though the system comes bundled with two wireless controllers, it is notable for being the first clone system to allow all three types of console controller (NES, SNES and MD) to be inserted into the unit and used. However, there is a switch to select which console to play, and each type of controller maps to their specific console (so it isn't possible to play NES or SNES games with a Mega Drive controller). The system is also compatible with more games than previous attempts, such as the rival Yobo FC3 Plus.