The app is already set when it starts and it warns you as soon as the battery level is 95%.
The app let you select one of two options (95% or 100%) to get a warning when your cell phone battery reach the percentage you pick. If you select 95% and you forget to unplug the charger when the alarm sound play , then the app shift itself on 100% option letting you to get a second warning sound.
The Alarms button lets you select a system alarms sound.
With the Our Sound button, you can select your favorite sound file.
Stop button simply stop and close the App.

Save your battery level, because it won’t go beyond 100%.
It is like want to fill a bottle of wine more than its capacity.

Hint:

It would be better off running the app in foreground, even though there’s a notification system if it’s running in background.