Okay so this is a famiclone and obviously the elephant in the room is that it's a total ripoff of another console: The Game Magic aka Nanica Smitch (bottom right). I don't know what that one on the top is doing there
Both of these work in basically the same way, the controllers are always connected wirelessly (and require batteries) even when attached to the console. Switches inside detect whether they're attached or detached and change the control config accordingly
From my estimation the H6 has 560 real games and the Smitch has 400. But the Smitch seems to have more actual NES/FC games whereas the H6 falls back more on Nice Code/Inventor stuff. Wouldn't be surprised if the ROMs were the same size
Here's the aliexpress link if anyone is into it https://www.aliexpress.com/item/1005007915689167.html
The new one btw is uncreatively called "H6". It's smaller than the smitch but the screen is brighter and actually the correct aspect ratio. They both claim "1000" games but have repeats, the included games and menus are different & tbh it's kind of a wash on which set is "better"