Important Tips: If the mounting surface is rough ,or non-smooth surfaces (e.g. textured dashboards), ), please use the included nano gel pads or round PC pad to ensure perfect suction. Installation steps: Clean surface & peel pad's protective film Apply the mat to the installation areaPlace the stand on the mat, press the top to release the air from the bottom, and use your other hand to turn the knob clockwise until tight. Note: Draw a circle with your fingernail-if the surface feels smooth and there is no sound, there is no need to use an adhesive pad for installation. After attaching the adhesive pad, please let it stand for at least 2 hours before installing the phone holder How to choose: The round PC pad is designed for one-time positioning and is not easy to tear off after sticking MSXTTLY nano gel pad can be reused multiple times by washing, and can be easily removed without leaving marks. Wide CompatibilityVmag-S1 airify magnetic phone holder is design