Closed back, on-ear model provides noise isolation and listening comfort in a compact, lightweight design.Connectivity Technology: Wired Made For iPod/iPhone cable with integrated 3 button smart remote and microphone Sennheiser engineered 18-ohm transducers deliver wide frequency response and high output levels when connected to portable audio devices Foldable stainless steel headband makes it easy to pack and store so Momentum On-Ear can travel with you. Detachable cable must be inserted until it "clicks" and twisted clockwise (to the right) to lock the cable in place. Two year warranty when purchased from an authorized Sennheiser dealer The second generation MOMENTUM On-Ear headset brings signature Sennheiser sound to an updated iconic design. Premium components like the stainless steel headband and Alcantara covered headband and ear cushions illustrate precision craftsmanship and exude luxury. The new folding headband design provides greater portability. A single-sided detachable cable incorporates an inline remote and mic for controlling music and taking calls. Two versions are available, one for Apple iOS devices and another for Samsung Galaxy devices and most other Android smartphones and tablets. Gen 2 MOMENTUM On-Ear again raises the performance bar for compact premium mobile headsets.