9.How to enable the USB DAC function?

For Mac computers, it is driver-free.

For Windows computers, please make the settings as the followed steps.
1.Install the FiiO DAC driver in the computer first.
2.Switch the working mode of the M11 Plus to USB DAC mode on the drop-down menu or go to Settings->Mode choose menu to enter the USB DAC mode.
3. Connect the M11 Plus to the computer by the USB port. Select the M11 Plus as the audio input both in the computer and the music app, so it can work.

When in the USB DAC mode, the M11 Plus does not support Bluetooth transmitting.