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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 Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET](https://www.cnet.com/a/img/hub/2014/11/18/db943d10-76a0-493d-a6f7-44db83205fb4/polar-m400-product-photos-15.jpg)
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 Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET](https://www.cnet.com/a/img/hub/2014/11/18/45a2abcb-a881-4df1-b4ec-bddb41cef8ce/polar-m400-product-photos-13.jpg)
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 Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET](https://www.cnet.com/a/img/hub/2014/11/18/d4058596-e577-4eda-8536-a2398b2f808e/polar-m400-product-photos-19.jpg)