AKG K450 Premium Foldable Headphone Navy Lightweight, closed-back design features soft ear pads for a comfortable fit that is perfect for everyday use. Connectivity Technology: Wired iPhone compatability allows use with an iPhone without the need for an extra adapter. High-performance, ultralinear sound, even at high volume levels, making it perfect for listening to today's music and movies Unique 3D-Axis folding design allows the K450's cushioned headbad to collapse along a 3 dimensional axis to fit easily The close-back design also ambient noise for a more relaxed listening experience.