The Koss Featherweight is a portable stereophone that delivers the full Sound of Koss. Delivering great sound performance, it is ideal for listeners seeking ultra-light headphones that don"t interfere with their fashion sense.The Featherweight is equipped with dynamic elements for an extended frequency response. It features an over-the-head design with contemporary styling. Perfect for use with portable mp3 players or ipods,it includes a straight single-entry four-foot cord. A 3.5mm (1/8") plug is included. The Featherweight by Koss is covered by Koss" No*Questions*Asked Lifetime Warranty.