Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
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Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Polar M430 review - Wareable
Polar - Extremes are easy. To help strike the right balance between rest, recovery and training—Polar M400 owners can now check out their training load, and recovery status, on Polar Flow. http://updates.polar.com/