Compare Polar M400 vs Polar RS300X - Polar M400 vs Polar RS300X Comparison by Price, Specifications, Reviews & Features | Gadgets Now
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Amazon.com : Polar M400 GPS Smart Sports Watch and Fitness Tracker (Black) : Sports & Outdoors
M400 GPS Sports Watch – Wearables.com
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Polar M400 User Manual | Caring for Your M400
