To connect your headset to a Windows PC via Bluetooth, you don't necessarily need an adapter. However, for a more stable and easier connection, the use of a Bluetooth adapter such as the Jabra Link 380 is recommended. This adapter is often supplied with the headset and provides a direct, pre-configured wireless connection. If you want to connect directly via Bluetooth without an adapter, you can do so by activating Bluetooth on your PC and selecting the headset from the list of available devices.