If there is no playback or button input for 15 minutes, the product turns off automatically. You can enable or disable the power saving mode as follows.
From the Home screen, tap Apps Key > Settings > Battery > Power saver > Turn Power saver on > set the desired option > slide the switch at the top of the screen ...
Turn Power saver on: Opens a dialog box to set the battery charge percent level to automatically turn on Power saver. Power saver Tips: Opens a screen with tips ...