It serves to lock the touch screen. Useful when you want to watch videos without interruptions, easy to use and with additional functions such as asking for a password to unlock and darken the screen if you just want to hear the sound. Features: - Simple design, just click on the Start button to lock (Don't forget to pause the app) - Easy to use, just press the notification to lock or unlock the screen - It has a light filter that can be used even if you do not want to lock the screen - A password that works by moving the cell phone (can be activated)