COLLAPSIBLE FEATURE: Take your wired headphones wherever you go. Just fold them up, twist up the cord, and be on your merry way Hands-free Talking And Volume Control: The built-in mic,remote and volume control lets you pick up calls and skip between tracks without missing a beat. Adjustable hinge: the adjustable headband gives your headphones some impressive flexibility so they can adapt to the shape of your head for a perfect fit.