Available for all smartphone and tablet. For tablets, dual use is recommended. The seat back can also be used as a hanger. Assembly:Remove the tape on the back of the metal plate. Stick the metal plate on the back of your device or on the inside/outside of the phone case at mid-level. Attach the phone holder to the headrest. Box Content: 1 Magnetic In-Car Phone Holder with Suction Cup, 1 Round Metal Plate.