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Amazon.com: Jiawu Smart Ring, Waterproof Ceramic Universal Wearable BT Connection Health Tracker for Mobile Phone, Sports Ring with Heart Rate Monitor, Sleep Temperature, Blood Oxygen (Black No. 17) : Everything Else
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Amazon.com: CENAP Fitness Smart Ring, Sleep Tracker Ring with Special APP and G-Sensor, Magnetic Charging, Waterproof and Energy Saving, for Monitoring Health, Body Temperature, Sleeping and Heartbeat, Fitness : Sports & Outdoors
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