Asus R552LF - Manual (Page 18)

18 Notebook PC E-Manual
Drive activity indicator
This indicator lights up when your Notebook PC is
accessing the internal storage drives.
Bluetooth / Wireless indicator
This indicator lights up when your Notebook PC’s
wireless function (Bluetooth or Wi-Fi) is enabled.
Capital lock indicator
This indicator lights up when the capital lock
function is activated. Using capital lock allows you
to type capitalized letters (such as A, B, C) using your
Notebook PC’s keyboard.
* on selected models only