Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Polar announces M400 footpod support, also smartphone notifications for V800/M400/A300 | DC Rainmaker
Polar M400 | Analysis, full test and opinion
Polar M400 with heart rate sensor review - The Gadgeteer
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Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Testbericht: Polar M400 - GPS-Pulsuhr mit Aktivitätstracker
M400 product support | Polar USA
Polar M400 GPS & Activity Tracker Watch In-Depth Review | DC Rainmaker
New Polar M400 options will color your run | TechRadar
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Testbericht: Polar M400 - GPS-Pulsuhr mit Aktivitätstracker
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
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Polar M400 Review | PCMag
Maintenance of your M400 | Polar USA
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Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Polar M400 Review | PCMag
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Polar M400 User Manual
