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M400 product support
Hands-on with the Garmin Epix GPS mapping & multisport watch
User manual Polar M400 (English - 100 pages)
Polar M400 GPS & Activity Tracker Watch In-Depth Review
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Polar M400 Review Tested by GearLab
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Polar M400 GPS & Activity Tracker Watch In-Depth Review
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Set up your Polar M400 and Polar Flow App on Vimeo