The working principle of the variable ID card is as follows: When the card is inserted into the computer, this pocket device reads and stores the information in the card through the security protocol, and displays an icon on the touch screen when it is finished.

When handling business, you must identify and select the service type through fingerprint, and then the pocket device encodes the information used by your card and makes it available. Common information such as credit card number and expiration date will be displayed in the card display area. You just need to brush it on the sensor like you usually use a magnetic card.

Although a card with only one code is attractive, security may be a better reason for choosing this device. Because pocket devices require secure biometric technology, they can only be used by legitimate users. If your wallet is stolen, the thief can't forge your identity.

In addition, even if someone steals the card during activation, the potential loss is not great-10 minutes later, the information on the card is forced to be unreadable and the sensor fails. When you insert the card into the computer, it means that your information does not need to be stored in the customer database of the computer or a website, so it is impossible for a thief to steal information through the network.