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Polar M400 User Manual
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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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Best Buy: Polar M400 GPS Heart Rate Monitor Watch Bundle Blue 90057187
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Polar M400 GPS Running Watch - Walmart.com
