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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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Amazon.com: Smart Ring, NFC Multi-Function Smart Rings Magic Wearable Device Universal for Mobile Phone, Connecte to The Mobile Phone Function Operation and Sharing of Data(7in) : Electronics
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