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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
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Testbericht – Polar M400: 2-in-1 am Handgelenk – GPS-Laufuhr mit Activity-Tracker in schickem Design - airFreshing.com
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