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Amazon.com : Polar H9 Heart Rate Sensor – ANT + / Bluetooth - Waterproof HR Monitor with Soft Chest Strap for Gym, Cycling, Running, Outdoor Sports : Sports & Outdoors
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Amazon.com : Heart Rate Monitor Chest Strap, iGPSPORT HR40 ANT+ and Bluetooth Waterproof HRM Sensor Compatible with Bike PC, Peloton, Zwift, Wahoo, Real-Time HR Data and Movement Dynamics in Exercise : Sports
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