An extremely durable construction and a folding headband for easy storage when not in use, the HD 4.20s is perfect for listening to music and taking calls on the go. The convenient 1-button smart remote on the cable allows to control portable device. Versatile and vibrant, the new HD 4 series offers you the complete Sennheiser quality package in a range of durable, closed-back over-ear headsets that fulfill your everyday aural needs. A genuine Sennheiser product, the closed-back over-ear HD 4.20s delivers on the promise of our brand name. It lets you enjoy your music in fact, any kind of music with its well-balanced sound and a powerful, dynamic bass.