When the battery level set by the user is reached, a charging notification song is played.
Also It will be notified by music when the battery has a full charge.

[main function]
- Alarm song setting function (with ringtone)
- Battery alarm level setting function (if set to 80%, alarm at 80%)
- Battery temperature alarm (overload, etc.)
- Volume control function.
- Vibration function
- Set the 'Do Not Disturb' time.
- Voice notification function (TTS).
- Battery status warning function
- Battery level display function at the top of the screen.
- Battery Widget support (3x1 & 4x2 size).
- Earphone detection function (replaced with PUSH notification when earphone is in use)
- Battery charge history