By the way, I did not properly write about SONOS ONE.
It is two years ago, it is in NY SOHOGo to the showroom of SONOS, I got a model called SONOS PLAY 1 at the time. This was the sound quality of the shock, but I have not coped with AirPlay yet. I have been using it for Apple Music playback only.
So, SONOS ONE that appeared full. I can play Air Play, ALEXA is also supported. The Google Assistant seems to respond soon.
Now I put this in my living room and office, I listen to FM by skipping radio stations from iPhone. I really like the sound. I was wondering why this sounds so good, but at the Japan launch event Giles Martin was introduced as a sound experience leader. Indeed it is not an audio maker's pro, it makes sounds, and I am acquainted that the listening professional supervised.
The feature of SONOS is that it connects to the net, but will not it be possible to get portable enough to connect with BT?

https://www.sonos.com/