The Switch won’t work with all Bluetooth headsets.
Consult the verified list (see below) before buying a headset for it.
How to Connect Bluetooth Headphones to a Switch
The Switch won’t work with all Bluetooth headsets.

From the Switch home screen, go toSystem options.
Choose your headset from the list of available devices.
It should then connect to the Switch.

The method still works.
The Nintendo Switch should recognize the rig.
You will see a prompt on the upper-left corner of the screen showing a USB volume control.

Nintendo
If the Switch is undocked, there’s only a singleUSB-Cport at the bottom of the rig.
If you want to go completely wireless, you need a USB-to-USB-C connector.
Plug the USB-to-USB-C connector into the USB-C port on the bottom of the Nintendo Switch.

Nintendo
Plug the USB dongle for your wireless headset into the connector.
It may take a few seconds for audio to transmit whether docked or not docked.
What If Your Headset Isn’t Working?
The Switch applies audio output only, which means microphones don’t work.
You also can’t connect a Bluetooth unit when more than two Joy-Cons are being used.
This means if you’re playing co-op with three or four buddies, your wireless headset won’t connect.
Below are some of the headsets known to work with the console.
If you own one of these headsets, try it out to see if it works.
For example, while many Turtle Beach Stealth models work with the Switch, the 420X does not.
FAQ
Toconnect an Xbox One controller to a Nintendo Switch, you need an adapter.
Go toSettings>Controllers and Sensorsand turn onPro Controller Wired Communication.
Then, hold down the pairing button on the controller and press the adapter button.
Toconnect Nintendo Switch controllers to your PC, add the controller as a Bluetooth equipment.