Grove - NFC Tag is a highly integrated Near Field Communication Tag module,this module is I2C interface,which base on M24LR64E-R,M24LR64E-R have a 64-bit unique identifier and 64 -Kbit EEPROM.Grove - NFC Tag attach an independent PCB antenna which can easily stretch out of any enclosure you use, leaving more room for you to design the exterior of your project.Specification: - Working Voltage:5V or 3V3- Working Current<1mA- 2CM max effective range- ISO 15693 and ISO 18000-3 mode 1 compatible- 64-bit unique identifier (UID)- Read Block & Write (32-bit blocks)- Grove I2C Interface