This app gives you only a black screen. It is useless for normal android devices. It works as a burn-in protector for plasma and Amoled Screens. On some TV Sticks (mk808) you cannot dim the TV screen and the screen time out is also not working. And if you only want to play only music (Spotify) then it could be possible that the screen will burn-in. Long tap anywhere on the screen to exit the app.