Designed to be placed at a safe distance from the air vent to avoid disturbance of airflow. The inner clip is protected with TPU material that can prevent major damages on the vent.
The double knob technology on this car mount offer a variety of viewing angles. 
Simply interlock the ball-joints into their respective sockets and tighten the angle adjusting screws after positioning each part in the angle you desire. Lastly, gently insert the holding clip onto an air vent panel and tighten until it stays firmly in place.
Please note that magnetic strength is best amplified against a flat surface.
Please Read! - A metal plate on the back of your device may interfere with wireless charging. Please make sure the metal plate is removed, along with the case if attached to it, or position the metal plate away from the battery portion of the device for a smooth, uninterrupted charge.