Strong magnet. The mounting plate that holds the phone in place holds it securely and rotates so you can adjust the phone's position to your liking. My only complaint is that our building instructions are incomplete. It appeared to be written by someone who speaks English as a second language. I have a small car so I decided to install it on the windshield. It has a strong suction cup with a lever that locks it securely in place. The suction cup has a sticky residue for added durability. You don't have to worry about dropping your phone, although I recommend that you remove it from your phone wallet if you're using one. My husband helped me and together we were able to figure out the installation guide. I received it yesterday and used it for the first time today. It exceeded my expectations. The cost was minimal compared to the countless other products made for the same purpose. I will update as needed if my mind changes in the future.
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