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"
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
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
This rare variant of the Wiii3 with an additional 7-games cartridge is one of the few places their 16-bit Sunplus games are known to have seen release (not my pic but this is the same model I have) and these videos are me finally finishing the job of capturing footage from it