The HD 4.30 a 3-button smart remote conveniently located on the cable, which allows you to control music and take calls with ease, and the sturdy folding design makes these headphones durable and compact enough to be taken anywhere. You can take it with you. 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. The HD 4.30 lets you experience the power and the quality of the Sennheiser sound anytime, anywhere. A closed-back over-ear design it creates an exceptional soundscape with precise acoustic response and a rich dynamic bass.