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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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ProDive Batery Kit for Polar FT4 FT7 Heart Rate Monitor Sports Watch, Replacemen Service Spare Set: Amazon.co.uk: Sports & Outdoors
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