Multiroom allows you to expand an ongoing playback experience to other Multiroom enabled speakers to play audio simultaneously, or to play different music on different speakers simultaneously.
From the Multiroom tab in the Bang & Olufsen app, you can expand playback onto more speakers from the current active speaker. Here's a guide to expanding music to multiple speakers.
Different music can be played on different speakers by selecting each speaker and starting playback separately. Here's a guide.
If you are wondering what Bang & Olufsen devices are supported for Multiroom in the Bang & Olufsen app, you can check that here.
Having problems setting up Multiroom? Find out more here.