User manual

Other Power Saving features
 Power Saving. When this is enabled, the system will close some
background apps to pause functions such as auto-sync. It will also reduce
screen brightness, turn off vibrate, and would be displaying the battery
icon in blue. To enable, just toggle [Power Saving] to green.
 Smart Power Saver (Recommended). This will intelligently identify the
running status of Apps when enabled. Just toggle [Smart Power Saver