Circular™ Smart Ring | Sleep, Energy, Performance. Evolved. by Circular — Kickstarter
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Amazon.com: CatXQ Smart Ring Compatible with iOS Android,2 NFC Safe Quick Trigger Instruction (Phone/Location/SOS),Support Simulation of 4 ID/IC Smart Cards,Waterproof,Ceramic Ring for Men Women (Size:9) : Electronics
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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(11in)
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RFID / NFC Smart Ring - Size 10 - NTAG213 : ID 2804 : $44.95 : Adafruit Industries, Unique & fun DIY electronics and kits
RingConn Smart Ring: Smartest Wearable for You | Indiegogo
RingConn Smart Ring: Smartest Wearable for You | Indiegogo
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Smart rings let you hide the phone but keep the alerts
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Smart rings have a long way to go - The Verge
