What devices are supported for Multiroom?

The Bang & Olufsen app supports fully set-up and multiroom content control:
Beosound 1,
Beosound 2,
Beosound 35,
Beosound Moment,
Beosound Essence 2nd Gen,
Beoplay M5,
Beoplay A6,
Beoplay A9 2nd Gen,
Beosound Shape,
Beosound Core,
Beovision Avant NG,
Beovision Horison,
Beovision 14,
Beovision Eclipse,
Beovision Harmony,
Beosound Stage.  

BeoSound Essence 1st Gen for Deezer and TuneIn content.

Some older Bang & Olufsen devices will be limited to set-up and configuration in the Bang & Olufsen app. These are the Beoplay A8, the Playmaker, the Beoplay A9 1st Gen, the BeoLit 12. 

The Bang & Olufsen app will support using TVs as a multiroom speaker. This applies to Beovision Avant, Beovision 11, Beoplay V1, Beosystem 4 (those TVs which are running VE.1x).