I purchased this K&F Concept magnetic holder for use in the car and I must say that it amazed me from every point of view. The vacuum base with adhesive gel is one of the best I have ever tried: once fixed on the windshield or dashboard (smooth), it remains perfectly stable even after many hours of driving or with strong vibrations. The rotating vacuum closure system is simple but ingenious: just press and rotate to create a very firm grip. The magnetic force is impressive: the 20 N52 magnets keep the smartphone glued even on bad roads or during sudden braking, without the slightest risk of it falling. I use it with an iPhone equipped with MagSafe, but it also works perfectly with other phones thanks to the magnetic rings included in the box. It does not interfere in the least with the GPS signal or with wireless charging. Another strong point is the 360° adjustment on three axes: you can orient it however you want - vertical, horizontal or inclined - and the zinc alloy hinges are solid, there is no feeling of play or fragility. It is built with quality metal materials, beautiful to the touch and durable over time, with an elegant design that adapts to any car interior. The nano gel base is washable and reusable, so there's no need to buy replacement stickers: just rinse it and it'll be as good as new. It's also surprisingly heat resistant, so it doesn't come off even after hours in the summer sun. Finally, it is very compact and foldable: it folds up in a few seconds and takes up very little space, also ideal for those who want to move it around the house or office (perhaps to use it as a desk support).