Polar unveils an affordable heart rate tracking armband | Engadget
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Polar Verity Sense Optical Heart Rate Sensor – HeartRateMonitorsUSA.com
Polar OH1 Armband | 21RUN
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