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Road Trail Run: Polar M430 GPS Heart Rate Watch and Polar Flow Review: Simple, Comfortable, Accurate with a Great Free Training Platform
Polar M400 Review | Tested by GearLab
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Best Buy: Polar M400 GPS Watch with Heart Rate Black 90051339
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Tech Review: Polar M400 GPS Running Watch - That Shelf
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