Huntsman Elite LEDs

I have read the book that came with my keyboard and searched the forums. All I want to know is, What do the 5 LEDs (Above the arrow keys.) on my Huntsman Elite keyboard indicate. The first one (On the left under the "del" key.) is the Caps lock indicator. What about the other 4?

Also, when I go to the support page, it asks for my keyboard serial number. When I type it in, it doesn't recognize it.