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Amazon.com: eTTgear Smart Ring - Fitness Health Tracker for Heart Rate Monitor, Sleep Monitor, Pedometer, Body Temperature, Blood Oxygen, App Compatible with iOS/Android, IPX8 Waterproof, Women & Men : Sports & Outdoors
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Amazon.com: Motiv Ring Fitness, Sleep and Heart Rate Tracker for iPhone and Android - Waterproof Activity and HR Monitor - Calorie and Step Counter - Pedometer. Ring Sizing Set and Redemption Kit
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