This application was actually designed to display only a black screen on your device.

Some utilities:

- Save the device battery while it is not locked, like a screen saver.
- Avoid unlocking the device with password several consecutive times and in a short time, just by switching between the apps;
- Easily shows scratches on the screen;

Some uselessness:

- People bored using phones;
- Fun, for example, saying that your cell phone is damaged, stuck or anything;

Have fun!