Best Buy: Marseille MClassic Plug and Play Graphics Enhancer for Switch & Retro Game Consoles Black MC9007-A
mClassic: The World's First Plug and Play Graphics Processor - Walmart.com
Marseille FAQ (Frequently Asked Questions)
Marseille mClassic Plug-and-Play Video Game Console 1440p/4K Upscaler - Upgrade Your Graphics Card in Real Time with No Lag for Nintendo Switch, PlayStation, Xbox, Wii, GameCube, Dreamcast and more!: xbox: Video Games -
Buy Marseille mClassic
mClassic tip: use HDMI female to female adapter to easily switch between different sources (in my case PS3 and Wii U) : r/PS3
Review: mClassic game console graphics processor - Pure Nintendo
The mClassic and the Nintendo Switch - Tales of the Aggronaut