Hitachi W50 Owner's Manual page 15

4. Select a music source or music service.
5. Select a song, channels, play list, etc.
Note : You can listen to synchronized sound from multiple Hitachi Wi-Fi
speakers (additional speakers sold separately.)
: Music playback may continue to play, when using "Music Services"
in the "Hitachi Wi-Fi Speaker" app, if you do not press pause before
exiting the app.
15