Have you heard of the passive RFID, I do not know what this is, but I know the supermarket will be used later, because the cost is relatively high, so there is not a lot of input. The development of science and technology is too fast, and then do not learn some of the RFID like it, to give you a friend mentioned this passive, a friend is a face stunned expression, we are too outdated. Later I asked one of my cousins, he said he knew what is passive RFID, I asked him to please, give me my cousin introduced, patting my head, so simple things do not know ah, really, not just don’t know it, who wants him to be is the electronic technology professional students. In the future, do not know how to ask the electronic aspects of his good.