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RFID / NFC Smart Ring - Size 12 - NTAG213 : ID 2806 : $44.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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KangQi NFC Ring Universal Sensing Technology Comfortable Wear No Charge Smart Lock NFC Ring for Mobile Phone Black US 8 - Walmart.com
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Visa Introduces NFC-Enabled Payment Ring for Team Visa Sponsored Athletes to Use at Rio 2016 Olympic Games | Business Wire
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