I know that lots of people would like to listen to music during class in a very secret, efficient way. I know how it can be done. All you need is a MP3 player, Mini Disc player, CD player or any audio device with a stereo/headphone jack. There is a small antenna that plugs into your audio device's stereo/headphone jack. You also get a specially designed pencil which has a built-in receiver and speaker at the end. So what happens is you turn on your audio device and the music is sent...