AMOLED Saver has excellent effect to protect the AMOLED screen from Burn-In and reduce the battery usage if you want to listen to the audio only while using YouTube or video player that is stopped in display off state.

If Saver is run during video playback, screen is being black like display off state but the video will not stop playing.
When not during video playback or it is ended, the screen will be turned off as soon as possible.
If you do not select 'Auto Clear Saver' or Run Saver immediately in the notification window, knock-knock the screen to clear it.
Saver is cleared automatically when the screen is turned off.
If you touch and hold the screen while Saver is running, it will let you know that by short vibration.

Saver is not running in the lock screen.

Supported Resolution: 1440x2560, 1080x1920, 800x1280, 768x1280, 720x1280, 540x960, 480x800, 960x1280, 768x1024

Caution)
Soft keys are shown on the screen in the devices like Google's Nexus series thought Saver is running.

* appwriter