Heos by Denon
Basically Denon’s answer to Sonos.. but with more connectivity & product options plus arguably better sound quality.
The free HEOS app instantly gives you multi-room audio control, and it can be installed on as many phones and tablets as you like. Command music in every room from any device. Use your multi-room audio system to group several rooms together and play the same song- perfectly synchronized in party mode. Or, play a different song in every room when everyone wants to dance to their own tune.
Available from Avolution.