Power Saving Mode is a convenience feature that allows you to reduce the battery consumption of your device 

by automatically playing battles without displaying the game screen.

You can set automatic Power Saving Mode at the bottom of the in-game Settings > Controls tab.

You can set automatic Power Saving Mode in 5, 30, or 60 minute increments, or turn it off. 

You can also set to turn off the mode when your character is hit by another character.

※ Select the Lightning icon in the bottom left corner to immediately enter Power Saving Mode.