Circular™ Smart Ring | Sleep, Energy, Performance. Evolved. by Circular — Kickstarter
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Digital Smart Ring to Track Sleep and General Health | NexRing
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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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Multifunctional Magic NFC Smart Ring Wearable For Android IOS Mobile Phone Rings | eBay
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Oura Ring. Smart Ring for Fitness, Stress, Sleep & Health.
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/cdn.vox-cdn.com/uploads/chorus_asset/file/23035230/vsong_211117_4890_0010.jpg "Smart rings have a long way to go - The Verge")