This is a posable action figure of a character from science-fiction/anime.

In this amazing limited-release toy, Megatron transforms from a Sega Mega Drive (known as a Sega Genesis in North America) into his own sweet robotic self! Unfortunately, you can't actually use this item to play videogames--it must be noted that this is NOT an actual, functioning videogame console. Megatron stands a mighty 19cm tall in his robot form. This fantastic item is a collaboration between Sega and Takara Tomy, and it's a must-have for Transformers fans!