NFC Ring lets you unlock your door by giving it the finger
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Smart rings afford a variety of touch and mid-air gesture input
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Jikolililili Smart Ring Can Unlock Smart Door, Lock Important
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Unlock the door by NFC Ring
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NFC Ring lets you unlock your door by giving it the finger
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Cheap Waterproof Digital Smart Ring NFC for Android Mobile Phone
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YEEUU R2/FIDO Smart Handle, App-enabled, with Fingerprint and NFC