It will be notified by music when the battery is fully charged. Easy to use app. [How to use] -Connect the charging cable. -When charging is complete, give an alarm with a song or ringtone. -When charging is complete, disconnect the power cable or close the completion window to stop the notification song automatically. [Function] -Low battery notification (TTS and ringtones can be set). -Notification song setting (including ringtone) -Battery notification level setting (80% notification when s