I've bought the dongle to connect it to the Kopfhöhrerausgang my TV. This works without problems (with me in combination with a MW600 Bluetooth headset).
It is very convenient that the dongle can be connected to the mains supply. Ie once plugged in and turned on, then you have no longer ran to the dongle. Only the Bluetooth headset I put on or off - the coupling works constantly at once.