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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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Slabo Ladekabel Micro USB für Polar M400 / M400 HR Datenkabel Verbindungskabel Sync-Kabel - SCHWARZ | Black: Amazon.de: Computer & Zubehör
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Amazon.com: ReadyWired USB Charging Cable Cord for Polar A360, A370, M400, M450, V700 Fitness Tracker : Electronics
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