Do A5+ Wireless speakers have an auto-sleep, idle, or auto-power-off function? And can I leave them on all the time?

The A5+ Wireless have an idle mode which is engaged automatic when nothing is playing.  The lights will remain on and solid and nothing needs to be done to resume audio playback.  The sleep mode on the A5+ is manual and can be toggled on/off by pressing the volume knob in or by clicking the moon button on the A5+'s remote, so it won't go into sleep mode automatically. Sleep mode will just reduce the power more than idle mode. It is perfectly fine to leave your A5+s powered on when not in use!