Testbericht - Polar M400: GPS-Sportuhr und Fitnesstracker
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Polar M400 User Manual
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Polar M400 review | TechRadar
Testbericht: Polar M400 - GPS-Pulsuhr mit Aktivitätstracker - Technikblog
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
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