Thanks to the special headband, the new Sennheiser headphone can be use extra small space in your backpack. The revolutionary new headband is changeable like the watch bands therefore help to expand yourself on the go. The most important part of the headphone is the housing, which made by aluminium. Very durable, great for traveling, lightweight and give premium feeling to the headphone. The on/off noise cancelling button help you relax or feel the rithm of the city. And this new Sennheiser with the music module more to lover than accessory.