If one of NUM, CAPS, or SCROLL.LOCK is checked, the corresponding LED will be shown on the applet.
Sets the refresh time of the keyboard LEDs status. Possible range is from 50 ms to 500 ms. Higher the refresh time if the system load is too high.
If this is checked, when the mouse goes over a LED, a tool tip indicating the name of the LED will be displayed. It also enabled tool tips in the Preferences Dialog.
If this is checked, it is possible to bring up a popup telling the states of any of the LEDs by left-clicking on the applet.
If this is checked and if your X-server supports it, it is possible to toggle a LED by left-clicking on it.