macos 10.14.6, blueooth headphones connected, but only input is listed

[funkyfrank]

I have a generic bluetooth dongle (Cambridge Silicon Radio 0x0A12). When I try to connect my bluetooth headphones, it is listed in the bluetooth list and also connects, but then it is only listed under audio input devices, not under output devices. This is quite annoying.

Do you have any idea how I can make it connect as a headphones?