![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/d4058596-e577-4eda-8536-a2398b2f808e/polar-m400-product-photos-19.jpg)
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
![Awinner Case for Polar M400 M430,Shock-Proof and Shatter-Resistant Protective Band Cover Case for Polar M400 GPS Smart Sports Watch (Gray) : Cell Phones & Accessories Awinner Case for Polar M400 M430,Shock-Proof and Shatter-Resistant Protective Band Cover Case for Polar M400 GPS Smart Sports Watch (Gray) : Cell Phones & Accessories](https://m.media-amazon.com/images/I/61EpPLbHqOL._AC_SL1500_.jpg)
Awinner Case for Polar M400 M430,Shock-Proof and Shatter-Resistant Protective Band Cover Case for Polar M400 GPS Smart Sports Watch (Gray) : Cell Phones & Accessories
![Polar M400 Activity Tracker/GPS Running Watch With Heart Rate Sensor! | Gadget Explained - Reviews Gadgets Electronics Tech Polar M400 Activity Tracker/GPS Running Watch With Heart Rate Sensor! | Gadget Explained - Reviews Gadgets Electronics Tech](https://1.bp.blogspot.com/-96kJ_YcnjL4/VsiPBiWUzVI/AAAAAAAAB40/Xc32uC6eIp4/s640/IMG_20160218_153142.jpg)
Polar M400 Activity Tracker/GPS Running Watch With Heart Rate Sensor! | Gadget Explained - Reviews Gadgets Electronics Tech
![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/c7c441cb6aaaaaab2c03f0c0e833b6fdf744cccf/hub/2014/11/20/2b4eef50-b6e6-4a90-a19e-755b53f16f30/polarm400.jpg?auto=webp&fit=cover&height=482&width=856)
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/2014/11/18/616b2599-c792-4105-b6c0-f449f8c3ab5f/polar-m400-product-photos-10.jpg)