I am selling a Sega Megadrive/Genesis Demo System DS-16 with its original button.

The unit is listed as non-working because I don't have a Sega Genesis to 100% test it, I only own a European Mega Drive.
It needs about a minute to kinda warm-up and will "work" with a mix of Genesis & Mega Drive games.

Since there is not a lot of information about that system online, the warm-up is perhaps normal.