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Polar Verity Sense - Optical Heart Rate Monitor Armband for Sport - ANT+ and Dual Bluetooth HRM - Waterproof HR Sensor with only One Button - Compatible with Peloton, Zwift and other apps, Gray, M-XXL : Sports & Outdoors - Amazon.com
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Garmin HRM-TRI/SWIM Bundle Waterproof heartrate monitors for pool swimming and triathlon at Crutchfield
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