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Testbericht: Polar M400 - GPS-Pulsuhr mit Aktivitätstracker
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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: A feature-packed GPS running watch that can also track your steps and sleep - CNET
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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
Testbericht: Polar M400 - GPS-Pulsuhr mit Aktivitätstracker
