Asus V550CM - Manual (Page 16)

16 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.
Number lock indicator
This indicator lights up when the number lock function
is activated. This allows you to use some of the keys on
your keyboard for numeric input.
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.