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Amazon.com : Polar M400 GPS Smart Sports Watch and Fitness Tracker (Blue) : Sports & Outdoors
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User manual Polar M400 (English - 100 pages)
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Amazon.com : Polar M400 GPS Smart Sports Watch and Fitness Tracker (Blue) : Sports & Outdoors
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Polar M400 GPS & Activity Tracker Watch In-Depth Review | DC Rainmaker
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