Another Chinese scam.. the magnet does nothing and the little piece of metal that it has, supposedly to stick to the phone, simply never sticks... SCAM

During the summer months, the glue melts and the phone falls off. It does not fit all air vents.

At intervals, you have to remove it from the gears it sits on because over time the fastening clamp becomes crooked, but with a little opening and closing, it returns to its original position.

Well, it is relatively stable. The small magnet doesn't do much work, so I also use the big one that sticks to the device. There is no magnetism issue as they say with the maps. The phone doesn't fall in potholes, but in faster turns it easily comes off the vent... to avoid it hanging in an ugly way, I attach it to the lowest point of the vent and at an angle, so it doesn't hang. You can have it for a while until you find something better. For its price, it's okay.