More aboutsound reactive dual blue cold cathode lights
Some lights have a little sound sensor that you can put in front of one of your speakers or subwoofer. It just makes the lights flash to the beat of the music you're playing or the sound effects from a game.
A perfectly good excuse for the really loud case! :P No really, I don't use the sound reactive stuff but I got just about similar stuff. It's Vantec Nexus fan controller with two 12" cathode lights.