1. 【Amazing Magnetic Force】Four-piece-magnet provides an intensive force of attraction which helps your phone stop swaying or falling. The magnet is strong, but no communication interference.【Remove your device on an angle】 2. 【Strong 3M Mount Design】Super strong 3M adhesive helps the mount steady enough to stay attached to the louver and protect your device from swinging up and down no matter how bumpy the road is. 3. 【Special Protection Concern】Two protection films are extra for your installation which protects your phones from adhesive residue and makes it easier to remove the plate when you need. Extra film, particular concern. 【Warning】Since the thick phone case would significantly weaken the magnetic force, please adhere the metal plate directly to back of your case and use it right above the mount. If the thin case, just takes off the case and slide the metal plate between your device and case.