Inatallation way:
1.To install the rotary knob
2.Place the produc to the cup seat.Tighten or release the rotary knob of the base for adapting to the cup seat
3.Release the rotary knob and adjust the pole to a desired height and angle,then tightenthe knob.
4.Press the button to release the arm and place your phone
5.Press the arms to the phone and secure your phone in place
6.Adjust available angle