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![Updated] Why I switched from Garmin to Polar M400 - Middleagemarathoner.com](https://middleagemarathoner.com/wp-content/uploads/2016/10/Polar-Flow8.jpg "Updated] Why I switched from Garmin to Polar M400 - Middleagemarathoner.com")
Updated] Why I switched from Garmin to Polar M400 - Middleagemarathoner.com
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Polar M400 review
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Smartwatch Battery for Polar M400, M430 - 190mAh 3.8V Li-polymer | 888402435
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Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
