One-touch button activates the side arms to extend. Push in side arms to securely accommodate the size of your smartphone. Cradle can hold devices up to 3.5 inches wide. • Cradle has durable arms and has 360 rotation capability. Phone can be positioned in any desired angle. • Extra-large suction cup with lock button conveniently attaches to windshield or any other smooth surface and easily removable. • Effortless maintenance of suction cup by wiping with a damp clothYONGFA