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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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Amazon.com: XHNee Fit for Polar M400 Case, Polar M430 Silicone Replacement Protective Case Frame Shock-Proof Cover Protector Shell Bumper Sleeve for Polar M400 / M430 Smartwatch (Black) : Cell Phones & Accessories
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Amazon.com: QGHXO Band for Polar M400/M430, Soft Adjustable Silicone Replacement Wrist Watch Band for Polar M400/M430 Watch (Black) : Cell Phones & Accessories
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![Amazon.com: XHNee Fit for Polar M400 Case, Polar M430 Silicone Replacement Protective Case Frame Shock-Proof Cover Protector Shell Bumper Sleeve for Polar M400 / M430 Smartwatch (Black) : Cell Phones & Accessories Amazon.com: XHNee Fit for Polar M400 Case, Polar M430 Silicone Replacement Protective Case Frame Shock-Proof Cover Protector Shell Bumper Sleeve for Polar M400 / M430 Smartwatch (Black) : Cell Phones & Accessories](https://m.media-amazon.com/images/I/71yYGn1JSyL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: XHNee Fit for Polar M400 Case, Polar M430 Silicone Replacement Protective Case Frame Shock-Proof Cover Protector Shell Bumper Sleeve for Polar M400 / M430 Smartwatch (Black) : Cell Phones & Accessories
![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/e30a762c23e356287abeecb843d958f2fffe3036/hub/2014/11/18/97390ec4-0385-495c-bcf4-4496555bb14c/polar-m400-product-photos-09.jpg?auto=webp&width=1200)