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Polar M400 review | TechRadar
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Polar M400 GPS & Activity Tracker Watch In-Depth Review | DC Rainmaker
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Polar M400 Review | PCMag
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Wearables | Polar M40 Running Watch | Poshmark
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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 Sports Watch (Blue) 90057183 B&H Photo Video
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