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Amazon.co.jp: POLAR 92083450 Polar Verity Sense Optical Heart Rate Sensor, Gray, Armband, Temple Measurement, Waterproof, Swimming, Bluetooth, ANT+ Connection, Scandinavian, Genuine Japanese Product & H10 N, Black, XS-S 92075964, Black, XS-S (Set
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Amazon.com : COOSPO Armband Heart Rate Monitor, Bluetooth ANT+ HR Optical Sensor for Sport, Rechargeable Dual Band IP67 HRM, Compatible with Peloton,Wahoo,Polar,Strava,Zwift,DDP Yoga : Sports & Outdoors
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