![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
![Recently I bought myself a Mi Band 4, and my sister let me know that you can change its appearance to a custom one. You know I had to do it. (Didn't Recently I bought myself a Mi Band 4, and my sister let me know that you can change its appearance to a custom one. You know I had to do it. (Didn't](https://external-preview.redd.it/2tAOOZaMhWTA1_ySZukSJLvAfS6g0V8spJPjbDc6vhg.png?width=640&crop=smart&format=pjpg&auto=webp&s=567fbc2d42f4f3af708822b64cbb8492d88f8022)
Recently I bought myself a Mi Band 4, and my sister let me know that you can change its appearance to a custom one. You know I had to do it. (Didn't
![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/b27e0fe0-3ac7-4980-b3b6-9c78eb666205/polar-m400-product-photos-12.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/resize/79fcd5094b3bf8a8174df48174f72a9d18020aee/hub/2014/11/18/616b2599-c792-4105-b6c0-f449f8c3ab5f/polar-m400-product-photos-10.jpg?auto=webp&fit=crop&height=1200&width=1200)
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)