Fiio JM21 - What Power Supply Adapter Is Suggested to Charge the JM21

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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 JM21 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 JM21?
The JM21 doesn't support fast charging.It is recommended to use a
5V2A charger for charging.
Battery capacity: 2400mAh
Battery life: 12 hours (3.5mm standard headphone out)