Creazy NFC Multifunctional Waterproof Intelligent Ring Smart Wear Finger Digital Ring (10)

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