Exercise your right to a great soundtrack with the ultimate workout companion. Made of great PU metarial, Stylish design and color. Simply wrap the band around your arm or wrist and secure it with the adjustable fasteners. Then insert ASUS ZenFone 4 (A450CG) slides right into its pocket and stays there. Now plug your headphones into the jack and press play. The transparent front is another great idea, the touch screen of ASUS ZenFone 4 (A450CG) still works after you put it into the case.