Fiio M11S - In-Vehicle Mode

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integer value between 0 and 50 minutes. (Note that if it is turned OFF,
the idle shutdown function will be disabled.)
In-vehicle mode
【Principle】After turning on the In-vehicle mode, you can connect the
M11S to the on-board USB port, and the M11S will power on
automatically and switch to the In-vehicle mode screen when the
vehicle engine starts, and power off automatically when the vehicle
engine stops.