Deep Standby
The device also has the ability to automatically enter “Deep Standby” whenever the wired or wireless network connection is removed for more than 60 minutes in "Quick Start Mode". The front panel LED will turn off during Deep Standby.
To “wake” a HEOS device from Deep Standby, you must press the volume or mute buttons which will immediately turn on the front panel LED.
You also push the mute button for 3 seconds, the device enters the Deep Standby.