Polar M400: An activity tracker with the heart of a GPS running watch - Video - CNET
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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 launches M400 combined GPS watch and activity tracker + video
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Tech Review: Polar M400 GPS Running Watch - That Shelf
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Polar M400: An activity tracker with the heart of a GPS running watch - Video - CNET
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Polar M400: An activity tracker with the heart of a GPS running watch - Video - CNET
Track Your Workout Like a Pro Athlete With This Fancy Smartwatch
![](https://www.techallnews.com/wp-content/uploads/2018/04/Best-Waterproof-Fitness-Trackers.jpg)
Top Rated] 15 Best Waterproof Fitness Trackers 2022 (January. Updated)- Ultimate Buyer's Guide - TechAllNews
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The best fitness trackers you can buy right now - CNET
![](https://i.ebayimg.com/images/g/zWcAAOSwLQtgRkRI/s-l500.jpg)
Polar - M400 GPS Watch with Heart Rate - Black 90051339
![](https://www.cnet.com/a/img/resize/708c9ab49eaa1a59b7a511ca14925e80ed3a3825/hub/2018/09/11/ec27292d-61c6-4892-b508-1e5315810ead/polar-vantage-v-m-2.jpg?auto=webp&fit=crop&height=900&width=1200)
Polar's newest GPS heart rate smartwatch lasts for 40 hours - CNET
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Polar M400 GPS & Activity Tracker Watch In-Depth Review
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Polar M400 GPS Sports Watch without Heart Rate Monitor, Black : : Electronics