Not sure if nationwide but could be (same as Samsung replacement remote). Saw this in Livingstone store (only a few left on the shelf).
The HD 451 offers vibrant stereo sound with a powerful bass response as well as highly appealing aesthetics all in one compact package. Its state-of-the-art transducers deliver clear, vivid sound reproduction and the closed, circumaural design helps to shut out disturbing ambient noise for maximum listening pleasure in a variety of listening environments. Furthermore, the single-sided cable virtually eliminates tangling, thus guaranteeing improved freedom of movement on the go. Sennheiser’s HD 451: For outstanding stereo sound that you can enjoy anywhere.