Screen lock - virtual button is a simple application that can be used to turn off the display of any Android device and lock the device with a secure screen.

To use the app, first, you need to install the application and enable the Device Administrator permission. After that, you can start using the app by pressing the button "Power off" or "Lock".

In the first step, you will be asked to enable the Device Administrator permission, which is needed to secure the device.

After that, you will be asked to select the display you want to lock.

In the next step, you will be given the option to secure the screen with a pattern or PIN.

The application uses a secure lock that requires a PIN to unlock it.