Use a headset with Linux

Just plugged in my Sennheiser Bluetooth MB 660 USB headset into my Ubuntu 19.10 notebook and it works like a charm, recording my voice and playback, via USB cable and via bluetooth dongle - great. Here is dmesg's output once I plug in the dongle:

[87093.320546] usb 1-3: new full-speed USB device number 7 using xhci_hcd
[87093.476365] usb 1-3: New USB device found, idVendor=1395, idProduct=002d, bcdDevice=34.49
[87093.476370] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[87093.476372] usb 1-3: Product: Sennheiser BTD 800 USB for Lync
[87093.476374] usb 1-3: SerialNumber: A000870191701428
[87093.537658] input: Sennheiser BTD 800 USB for Lync as /devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.3/0003:1395:002D.0003/input/input19
[87093.601020] input: Sennheiser BTD 800 USB for Lync Consumer Control as /devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.3/0003:1395:002D.0003/input/input20
[87093.601700] input: Sennheiser BTD 800 USB for Lync as /devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.3/0003:1395:002D.0003/input/input21
[87093.602395] hid-generic 0003:1395:002D.0003: input,hiddev0,hidraw0: USB HID v1.11 Device [Sennheiser BTD 800 USB for Lync] on usb-0000:00:14.0-3/input3