Keychron M4 4K Wireless Mouse Review: Compact and Light, But Is It Right for You? 

That would be the M3 Mini 4K by far. The size and handling of both the 1K and 4K versions are absolutely perfect, in my opinion. I just prefer the 4K version for the cool dongle. The M3 Mini Metal is also pretty good, but I find it a little too heavy in comparison.

Yes, of course. The cables Keychron supplies with their mice are extremely lightweight too, so they create almost no resistance.

Yes when need charing just plug in, it seem only small head usbC go with the mouse fit