my holder break after use for a month . it have a design problem . there be a very strong spring inside the holder ' four screw be place in each side of the holder to place two plastic part together . there be nothing to support the two plastic part together in the middle where they place the spring at . what happen to my holder be that the plastic deform due to the strong tension inside . I be very disappointed at this product , since I be plane to drive one of my friend to the airport that day .