This is probably the most interesting feature of the Ace Ultra over the original Ace.
One press sends whatever’s playing on your speakers – a playlist, movie, vinyl – to Sonos Ace Ultra. Another press sends it back. No other headphones do this.
This feature is available in Early Access. Push and pull music between compatible Sonos products by pressing the Content Key. Control your headphones in the Sonos app when you are at home. Stream music over WiFi from your favourite music services and stations.
The Ace Ultra is not a full stand-alone member of the Sonos system, which people have long been asking for, and I suspect people will initially misinterpret this as (emphasis mine):
Headp

