What Bluetooth codecs does the M21 support? And how to switch the
Bluetooth codecs?
The M21 supports LHDC, LDAC, aptX HD, aptX, AAC and SBC. You can switch the
codec on the menu of Settings->Audio->Bluetooth Audio Encoder. Note that it
needs to be disconnected and reconnected to enable the new codec after
changing it.
What can be done if the volume is too low when the M21 is connected to
AirPods?
1.Go to System Settings-Audio and find the Bluetooth volume adjustment mode.
2.Switch the volume adjustment mode to Sync Bluetooth volume.
3.Disconnect and reconnect the Bluetooth device.
8. What power supply adapter is suggested to
charge the M21?
Fast charging protocols including PD2.0 or above are supported. If the power
adapter does not support neither the above protocol, it will not trigger the fast
charging function and super high gain but just common charging. For non-fast
charging adapters, it is suggested to use the 5V 1A/2A power adapters.
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