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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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Economical running watches that do almost everything: comparing Polar's M400 and Garmin's Forerunner 15 | NancyRuns&Writes
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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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Economical running watches that do almost everything: comparing Polar's M400 and Garmin's Forerunner 15 | NancyRuns&Writes
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