Switches between different operation modes.
Switches the screen's refresh rate.
Fn + R shortcut function is not available on all models and the switched screen refresh rates may vary.
Turns on/off the rear connector lights.
Turns on/off the "LEGION" branding light.
Lenovo Smart Key 
(Fn + F9) provides quick
access to Lenovo apps and service. Press the Smart Key to open the launch panel;
press the Smart Key repeatedly to cycle through items and hit
Enter to start the selected app or service.
Press Fn + Esc to enable FnLock. When FnLock is enabled, the Smart Key function is accessed by pressing F9 directly, without the Fn key.
There is also a trick to the Lenovo Smart Key. Go to Preference on the launch panel, select ADD and choose your favorite app to associate with the Smart Key. When it is done, press the Smart Key twice in quick succession and your favorite app is opened.