Fe151 Black Adjustable Circumaural Over Ear Stereo Pu Leather Earmuffs Folding Earphone Headphone for Pc Mp3 Mp4 Ipod Iphone Ipad Tablet Hidden structure can be stretched, it can meet different people it can be fold, easy to take Dynamic speaker to make high quality sound Use Semi-enclosed design to Avoid environmental noise Wearing size can be adjusted and it can be folded ,so easy to take