It has a Unifying Dongle to connect up to 6 Unifying devices (headset, mouse, keyboard, ...) plus Bluetooth. The headset can be paired with several devices via Bluetooth, but only one Bluetooth connection is connected. However, this is done at the same time as the Unifying connection. Bluetooth connection to the device with the dongle is also possible, but I don't see the use case yet.

Possible without any problems for me