Asus R552LF - Manual (Page 77)

Notebook PC E-Manual 
Select from these power saving modes.
Use these options to customize your
power saving mode.
This option allows you to hide
the desktop icons and turns the
presentation mode on or off.
Running System
This option allows you to enable either of the following power saving
modes in your Notebook PC.
NOTE: By default, your Notebook PC is set to Performance mode.
Performance mode
Use this mode when doing high-performance activities like playing
games or conducting business presentations using your Notebook PC.
Battery Saving mode
This mode extends your Notebook PC’s battery life while plugged in to
the power adapter or while running on battery power only.