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RFID / NFC Smart Ring - Size 7 - NTAG213 : ID 2801 : $44.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Smart Ring Wear Magic Finger NFC Ring for Android Windows Mobile Phone Waterproof Smart Ring – I Need Me One
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Amazon.com: Bkrtondsy Smart Ring for TIK-Tok Scroll Through&Flip Through e-Books&Give a Like&Compatible with ipad&Smartphones Take Pictures Video Music Play Pause Switching Touch Fingertip Controller (Size 9) : Electronics
A new Smart Ring patent from Google hints of using their Soli Radar technology to control mobile devices with Hand Gestures - Patently Apple
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