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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 GPS Sports Watch with Heart Rate Sensor
Polar M400 GPS Activity Tracker Watch Black | eBay
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Polar - Runners! Stride sensor support for Polar M400 is here. We've also improved the GPS fix! Learn more: http://bit.ly/1GJC6jr | Facebook
