this video shows how the blinking mod rock looks , its a rock whit a hole drilled threw it an led inserted into it powered by my c.b. power mic . its conected to the ground an the mod wire an lights up strong with good mod an weaker dim to less mod , also a good strong lightblink at the begin of a key up . hope this helps you if you deside to hook one up . i use it to see how much life is left in my powermic battery , ok i just like the blinky light led puts off lol