Our ultra magnetic car phone holder uses intelligent vacuo sensor and magnetic attractionto ensure strong suction. Especially suitable for car use, it can hold your phone firmly even under various road conditions such as sudden braking and speed bumps, making your driving safer. No Matter Where You Are, This Magnetic Car Phone Holder Suction Cup Can Easily Handle Various Surfaces, Including Metal Surfaces, Smooth Walls, Glass, Mirrors And Even Car Screens, Bringing Convenience To Your Daily Life. This product is suitable for car screens, mirrors, glass, tiles, smooth metal surfaces, etc. Not suitable for non-smooth surfaces and curved surfaces, such as non-painted wooden tables, rough metal surfaces, etc. Note: 1.Press and hold for 3-5 seconds to turn the machine on and off (red light flashes).