FiiO M11 Plus Portable High-Resolution Lossless Wireless Music Player - Manual (Page 53)

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Notes: Some onboard USB ports may encounter interruptions when connecting
to the M11 Plus, in which case you can try to use FiiO's USB isolator, the LA-UA1,
to fix the problem.
Double tap to wakeup
If the Double tap to wakeup function is enabled, the sleep device can be wake up
by double-tapping the screen.