Is it possible to turn on and off Primo? Does it have an auto on/off function?

Volumio Primo is an always on device.

There is no power switch.

You can turn on and off the system by the software UI and App.

There is also the SLEEP function that allows you to program when to stop the music and to turn off the system and the WAKE UP function to program the playback of a playlist.

See the video tutorial :