Sony Bluetooth Utility - Manual (Page 176)

You may now launch conferencing and voice-recognition software and use the headset.
Disconnecting from the headset
Please follow the steps below to disconnect from the headset.
Procedure
1. Right-click on the headset icon in the [Bluetooth Settings] screen, then click on [Disconnect].
A message will appear, requesting confirmation that you wish to disconnect. Click on the [Yes] button.
The icon on the [Bluetooth Settings] screen will appear as shown below, indicating that the device has been disconnected.
Page 176