FiiO M11 Plus Portable High-Resolution Lossless Wireless Music Player - Manual (Page 52)

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In-vehicle mode
【Principle】After turning on the In-vehicle mode, you can connect the M11 Plus
to the on-board USB port, and the M11 Plus 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.
【How to set】Go to Settings->Global->In-vehicle mode, or the drop-down menu
to turn on the in-vehicle mode.