A:AnswerHey there! Please note that the MX Keys S is a completely wireless keyboard and cannot be used in wired mode. The USB charging cable included in the box (USB-A to USB-C) is only to charge the keyboard and cannot transfer any data through it.
A:AnswerIt's both. You can use Bluetooth like you would with headphones or a mouse. Or you can just plug in the USB dongle. If you're using two or three devices, you can use the dongle for a computer and Bluetooth for the other two.
A:AnswerIf you’re going from red to full charge probably a couple hours. Plug it in when you go to bed and it will be fully charged when you wake up. It has pretty amazing battery life even if you leave it on all the time.