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TROGN Fitness Smart Ring, Sleep Tracker Ring, Activity Tracker for Heart Rate, Magnetic Charging, Waterproof and Energy Saving, for Monitoring Health, Sleeping and Heartbeat : Amazon.co.uk: Sports & Outdoors
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Fitness Smart Ring, Smart Health Ring with APP for Women & Men, Health Tracker for Heart Rate Monitor, Sleep, Pedometer, Body Temperature, Blood Oxygen, Bluetooth, IPX8 : Amazon.co.uk: Sports & Outdoors
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