Sennheiser HD 400S Foldable Closed-Back Headphones 508598, NOB Contents: Accessories in retail box. New Opened Box Condition. Features: The HD 400S features a one-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. Sennheiser dynamic drivers deliver a well-extended sound response with dynamic bass. Renowned Sennheiser sound quality for a unique listening experience. Built-in mi