FiiO M11 Plus Portable High-Resolution Lossless Wireless Music Player - Manual (Page 43)

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Power-off timer
There are two types of the timer, Sleep and Idle poweroff.
Sleep
The device will automatically shut down when the time reaches the set value. It
can be set to any integer value between 0 and 120 minutes. (Note that if it is
turned OFF, the sleep shutdown function will be disabled.)