You can connect the wireless adapter to a side USB port on the Nintendo Switch dock.
Then, Power on the headset.
Finally, when the wireless adapter status light is solid, the headset is now connected to the adapter.
You connect it to the headphones connector on the Switch console By using a USB-C adapter (not included in the package), or using the included 3.5mm cable.
Note: When you use the 3.5mm wired cable, the headset will disable the RGB light and mode setting, you could only adjust the volume +/_.