150,– EUR
JBL Charge 5
20 h, Rechargeable battery operated
JBL Charge 5
20 h, Rechargeable battery operated
As far as I know, this is not technically possible, there are only two different sources for Bluetooth connections.
However, with JBL you can connect an infinite number of Bluetooth boxes together, according to the master/sllave principle, which is how I solved it.