Closed back, over-ear model provides noise isolation and listening comfort in a compact, lightweight designMade For iPod/iPhone cable with integrated 3 button smart remote and microphoneSennheiser engineered 18-ohm transducers deliver wide frequency response and high output levels when connected to portable audio devicesFoldable stainless steel headband makes it easy to pack and store so Momentum can travel with you.Two year warranty when purchased from an authorized Sennheiser dealer