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Polar OH1 Heart Rate Monitor Armband | 21RUN
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Amazon.com : 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
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Road Trail Run: Polar OH1 Optical Heart Rate Sensor Review: a comfortable, accurate, and much-welcome alternative to the standard chest strap