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.
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 & Activity Tracker Watch In-Depth Review
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