The Sennheiser HD 457 are open, dynamic hi-fi stereo headphones for both mobile audio sources such as MP3, MiniDisc and CD players, and home hi-fi systems. Soul, funk, grunge, and percussion music can be heard to its best advantage due to the headphones' balanced sound image and warm bass. When out and about, a convenient cord take-up lets you adjust the headphone cable to the required length.