Sennheiser MX 560-B Basswind In-Ear Stereo Headphone (Discontinued by Manufacturer) Powerful, bass driven, stereo sound earphones High-performance dynamic driver system with Sennheiser "Basswind" system Frequency response: 19 to 20,000 Hz Cable winder for easy cable length adjustment Ideal for use with all MP3, CD, DVD players and portable gaming systems