Size: 5x5mm | Chip: NTAG213 (215/216/icode x/ Fudan F08 can be customized) | Induction distance: about 8-20mm (depending on the card reader) | Use: Bluetooth headset, Bluetooth speaker pairing, support IC card access control function | Working frequency13.56MHz; Maximum gain value 1.5dbm; Standard 14443A, 144 BYTES memory;Number of reads and writes >=100,000 times