I think the unit only has a receive function but no transmit function. So it is not multi-room capable.

No, the Grundig DKR 1000 can only receive BT - which makes little sense with the small built-in speaker.

Hello, as far as I have seen, the manual only mentions a receive function, not a transmit function. The device is at my parents' house, so unfortunately I cannot carry out a short-term test.