The KSE1200 is the second in our line of electrostatic earphone systems, following the release of our KSE1500, which was the world's first sound isolating electrostatic earphone system. One of the great things about electrostatic technology is the nearly massless diaphragm. This diaphragm weighs almost nothing, and it's suspended within this electrostatic field, and it can move as fast as that energy field moves, which means you get the fastest transient response, the most detailed clear transparent audio reproduction available. The electrostatic earphone systems from Shure provide exceptional clarity and detail, offering you the most high-fidelity portable listening experience available. The amplifier and the KSE1200 features the same award-winning electrostatic technology and performance as in the KSE1500. The purely analog KSE1200 is designed to get the best performance out of today's high-end music players. The earphones provide exceptional comfort, when you combine that with Shure's excellent sound isolating technology, you get a truly enjoyable listening experience.