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Amazon.co.jp: Motiv Ring Fitness, Sleep and Heart Rate Tracker - Waterproof Activity and HR Monitor - Calorie and Step Counter - Pedometer : スポーツ&アウトドア
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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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