A cable connection is not provided. Except for charging.
Here is the homepage with specifications:
https://www.jabraheadsets.ch/business...

I just tried it out - it works.
Headphones connected to Windows 10 notebook via USB-C-C cable, Bluetooth deactivated, Jabra Link 380 removed.
The headphones are recognised, as is the microphone.
So the headphones can also only be used with the USB cable.