The powerful MX 450 earphones feature Sennheiser's innovative "Basswind" system, a symmetrical cable and a convenient case with cord-winder. Features: - Ideal for portable players such as MP3 or CD - Powerful stereo sound Balanced "Basswind" system - Metal "Sound Protection System" protects the acoustic systems - Rugged design - Symmetrical cable (1 m) - Convenient case with cord-winder - 2-year guarantee