Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
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The feature-packed and waterproof Polar M400 offers a good set of features for beginners and advanced runners a like. It also provides feedback on your daily activities and sleep.
![](https://cdn.the5krunner.com/wp-content/uploads/2015/06/img_3742.jpg)
Polar M400 Review, Detailed, Discount Links
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Polar M400: Running and activity tracking in one (pictures) - CNET
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Polar M400 Review
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Polar M400 GPS & Activity Tracker Watch In-Depth Review
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Polar M400: An activity tracker with the heart of a GPS running watch - Video - CNET
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Tech Review: Polar M400 GPS Running Watch - That Shelf
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Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
![](https://media.dcrainmaker.com/images/2014/09/IMG_8352_thumb.jpg)
Polar M400 GPS & Activity Tracker Watch In-Depth Review
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Polar M400 GPS & Activity Tracker Watch In-Depth Review
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Polar M400 GPS & Activity Tracker Watch In-Depth Review
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Polar M400 GPS & Activity Tracker Watch In-Depth Review
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Polar M400: Running and activity tracking in one (pictures) - CNET