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Multi-functional NFC smart ring, the main function is to store and exchange personal information, as well as mobile content and personal privacy encryption unlock, support for Apple, Samsung, Huawei, millet and other DNF-enabled mobile phone. Specification: Size:6,7,8,9,10,11,12,13 (please refer to the size picture) Chip: NFC chip Working frequency band: 13.56MHZ Storage space: 144BYTES Transmission rate: 106kb / s Uses: set up smart lock, card recharge, smart phone unlock, phone important file lock, transfer files. Features: No charge, programmable read-only lock function, 7-byte serial number clone protection Package: 1 x Smart Ring