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Extremely controlled fourth -generation R4 smart ring NFC magic rings accessories R4 smart wearable ring ID access card IC IC
Sort by color:
Black No. 7 (finger is 54mm long)
Black No. 8 (finger is 57.1mm long)
Black No. 9 (finger is 60mm long)
Black No. 10 (finger is 62.8mm long)
Black No. 11 (the finger is 66mm long)
Black No. 12 (the finger is 70mm long)
Note: The mobile phone of different systems has NFC functions, and the functions that can be used are different.
Note: Apple mobile phones have little functional function, can be used as the access control card key
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