When the card holder of the reader/writer is used for too long or in a poor environment, it is easy to cause the card holder of the reader/writer to become dirty. Sometimes, it may also be caused by the user card chip sticking oil or other dirt entering the card holder. A significant phenomenon after the card holder is too dirty is that the system prompt message "Non local area card" always appears when reading the user card. The cleaning work of the card holder requires disassembling the card holder, which should generally be handled by our factory service personnel. In addition, you can also purchase a cleaning card for temporary cleaning work.