The Retron 5 is an emulation console based off Retroarch that uses original consoles and controllers. Some systems suffer from a lot of lag, but others are bearable. The Retrofreak might be a better option, as its essentially the same thing, but allows for direct playing of roms from an SD card.
When the Retron 5 was first released, I thought it was a neat toy…but I’m not sure I’d recommend it anymore. Most hardcore retro-gamers most likely won’t like it, as some of the systems have a bit too much lag and it’s not an exact re-creation of the original console (unlike an RGB-modded system with an XRGB Mini). If you’re looking to play a casual cartridge game, the Retrofreak might be a better option.