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Polar M400 User Manual
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Polar M400, GPS watch with activity monitor
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Polar M400 GPS & Activity Tracker Watch In-Depth Review | DC Rainmaker
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Polar M400 Men's Black Running GPS Watch Heart Rate Capable Watch *No Charger* | eBay
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Amazon.com : Polar M400 GPS Smart Sports Watch with Heart Rate Monitor (Black) : Sports & Outdoors
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Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
