Dell KM7321W User Manual page 8

NOTE: Caps/Num lock LED Behavior:
Both Lock LED will be "On" for 5 seconds once pressed and then goes "Off" even
if user continues to type under current state. LED will only be "On" for 5 seconds
again if user presses the Num Lock/ Caps Lock keys again. The lock state will
also be reflected in the OSD (On Screen Display) if the Dell Peripheral Manager is
installed on user's PC.
8 │ Features