NTAG 215 NFC TAG-NTAG215NFCT-001 is one type of NFC Tag, it's Consists of the chip, the sensor antenna,it's Packaged in a standard PVC, ABS, PET material card, No exposed parts of the card.the NTAG 215 NFC Tag  Reading and writing process, ibetween coupled resonant circuit with the reader via radio waves or contact contact To complete the read and write operations. the NTAG 215 NFC Tag is a non-powered,When the reader read and write to the card reader signals superimposed on the composition consists of two parts: one part is a power signal, the signal received by the card, rather than their own L / C resonance, producing an instant energy tosupply chips work. The other part is a combination of data signals, the command chip to complete the modification of data, storage and return it to the reader, to complete a read or write operation. The data on the card can save more than 10 years long,it's use to access control , attendance , schools , business , patrol management , hotel.etc...