Amazon.com: BoxWave Cable Compatible with Polar M400 (Cable by BoxWave) - DirectSync Cable, Durable Charge and Sync Cable for Polar M400 : Cell Phones & Accessories
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User manual Polar M400 (English - 100 pages)
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Polar - Not only a color, but a state of mind! For those of you who fancy a little splash of color to brighten up your day. Polar M400 is now available
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Smart Notifications with the Polar V800 and Polar M400 - YouTube
![Updated] Why I switched from Garmin to Polar M400 - Middleagemarathoner.com](https://middleagemarathoner.com/wp-content/uploads/2018/10/Polar-Flow11.jpg "Updated] Why I switched from Garmin to Polar M400 - Middleagemarathoner.com")