Great sound makes a big difference, especially when you hear every building block that creates the whole sound. Let the Sennheiser MX 400 II deliver your quality sound that is well-balanced in every aspect. The Sennheiser MX 400 II In-ear Phones give you a superior fit in the ear canals. This offers you the highest attentuation of ambient noise possible. It contains Neodymium magnets have been tuned to give you natural sound reproduction.