![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](https://www.cnet.com/a/img/resize/b8c3cdcf7de13896a35ecfe7b69108d9a65309c4/hub/2014/11/18/45a2abcb-a881-4df1-b4ec-bddb41cef8ce/polar-m400-product-photos-13.jpg?auto=webp&width=1200)
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
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