The controller for the cathode is encased in translucent plastic, and has two outputs so you can run a pair of lights off the same unit. The smaller vent to the left is actually the microphone, and the larger one on the right is a vent to expel heat. When the light is active a Blue LED turns on, and believe me, the Blue LED is bright. I find it surprising they used a method this bright to show the unit is activated because the LED would actually interfere with the color coming form the cold cathode. If they are going to use a bright LED, they should have at least ensured that the color matches the light.



Link: Pimprig