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Polar CS300 Heart Rate Monitors user reviews : 2.4 out of 5 - 8 reviews - roadbikereview.com
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Polar CS300: Multi Use - Multi Bike HRM - PezCycling News
Replacement Battery CR2025 for Polar Heart Rate Monitors & Transmitter – HeartRateMonitorsUSA.com
Amazon.com : Polar H1 Heart Rate Sensor Black, M-XXL : Sports & Outdoors
