FiiO M11 Plus Portable High-Resolution Lossless Wireless Music Player - Manual (Page 24)

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9. What power supply adapter is suggested to
charge the M11 Plus?
QC2.0, QC3.0 and MTK PE quick charging protocols are supported. If the power
adapter does not support the above protocols, it will not trigger the quick
charging function. Therefore, it is not suggested to use it.
For non-quick charging adapters, it is recommended to use the 5V 1A/2A
adapters.
An introduction to system settings
menu
Here is the system settings menu of the M11 Plus.