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Amazon.com: Polar Grit X Pro - GPS Multisport Smartwatch - Military Durability, Sapphire Glass, Wrist-based Heart Rate, Long Battery Life, Navigation - Ideal for Outdoor Sports, Trail Running, Hiking : Everything Else
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Polar H10 Heart Rate Monitor for Men and Women – ANT +, Bluetooth, ECG/EKG - Waterproof HR Sensor with Chest Strap : Amazon.co.uk: Sports & Outdoors
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