Mr. Man-wai Chang,
>
> You mean when its "on" the wireless mode is active - regardles of if the (PC
> / USB) connector is plugged in and its recharging the battery - and when its
> "off" the wireless doesn't work - even though it could still charge the
> battery - and its just a standard PC / USB keyboard ?
>
> What do you think that the switches labeling should have said instead ?
Keyboard in question: Acer OKW132 mechanical keyboard
ON - WiFi Active LED flashes. That keyboard is in wireless mode, I suppose.
OFF - WiFi Active LED no longer flashes. I suppose that means wired mode, and I need to plug in the USB cable from the PC.
Regardless of the state of the switch, the type-C cable always charges the battery, as displayed by the battery LED.
I haven't had the time to open the keyboard, because you need to unmount all Cherry switch first, nearly 80 of them.