Amazon.com : POLAR VANTAGE M –Advanced Running & Multisport Watch with GPS and Wrist-based Heart Rate (Lightweight Design & Latest Technology), Black, M-L : Sports & Outdoors
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Road Trail Run: Polar Vantage V and M Introduction: 14 Sensors Polar to Measure Wrist HR in the V & M, Running Power and Muscle Load Metrics in the V, Battery Life