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Polar M400 Review | Trusted Reviews
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Polar M400 with heart rate sensor review - The Gadgeteer
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 | Trusted Reviews
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Best Buy: Polar M400 GPS Watch with Heart Rate Black 90051339
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Tech Review: Polar M400 GPS Running Watch - That Shelf
Maintenance of your M400 | Polar USA
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