Nintendo Switch Manual page 27

also play Nintendo Switch with the Pro Controller
(sold separately). This controller allows you to play
comfortably for longer periods of time when the
console is in TV mode or tabletop mode.
When you are using the console in TV mode, you
can attach the Pro Controller to the dock with the
USB charging cable (HAC-010) to pair or charge
it.
When the Pro Controller is done charging, you can
disconnect it from the USB charging cable and use
it wirelessly.
USB Type-C™ and USB-C™ are trademarks of the USB
Implementers Forum.