In addition to the lights pulsing to the beat of the music or to your heart, there's also a five-way d-pad controller that communicates with your phone over EL glowing earphone. You can use the controller to do all the usual things, like change the volume, play/pause music and switch tracks. It should work with most music apps like Pandora, Rdio and Spotify. Pressing the center button would activate voice commands like Google Now and you can use it as a camera shutter button too. There's also a separate phone button to answer or reject calls, and that d-pad has a clip on the rear.
Why not get a EL glowing earphone for yourself?