1. parallel the electronic device to the vacuum suction cup head, and push the suction cup,let it stand for 1s,until the electronic device is tightly sucked,then you can release the hand for use. 2. About applicable scenes: suitable for kinds of Glass screen, smooth walls, mirrors, etc. If the scene used is not glossy , pls use the traceless sticker on the flat together, the effect be better; 3. About the magnetic vacuum function, if your mobile phone itself does not have magnetic vacuum or when the magnetic vacuum function is weak due to use the phone case, pls use the magnetic attracting ring together ,the effect be better; 4. Also about vacuum adsorption function,pay attention to keep the product Built-in battery fully .pls charge it in time. any help pls to message us Specifications: Product name: Car mobile phone holder X12 Automobike Holder Suction Cup for car Battery capacity: 100 mAh Charging interface: Type-C Applicable models: 4.7-inch smartphone or above Colour:As Shown Material:ABS+Alloy Please read carefully about the precautions for product use!!! Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Package Contents: 1 * Vacuum Adsorption Bracket Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.