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Amazon Halo: a fitness band and app that scans your body, listens to your voice - The Verge
Apple to buy Oura after Amazon launches Halo and Google buys Fitbit?
19 Best Smart Rings in 2021
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Amazon Rolls Out Halo, a Wellness Tracker That It Says Can Also Sense Moods - WSJ
TOP-9 best smart rings in 2021 from $15 to $200 | Buyer's Guide
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