The product is suitable for phones with magsafe function such as iPhone 12/13/14 series. It can hold three card. Up to three cards are recommended. Too many cards will affect the magnet function. It is recommended to take out the card form the card bag and swipe it With different electromagnetic induction schemes, access card and bank cards have different reading conditions. In addition, there are magnets and other elements in the card package material , which will affect the reading distance.Therefore, it is recommended to take out the card and swipe it, so that you will get a smooth experience.