Polar M400 Cable, BoxWave® [Colorific Magnetic Mini Cable] Colorful Mini Micro USB Cable for Polar M400, A360, V650 - Cosmo Pink : Amazon.ca: Electronics
Amazon.com: ReadyWired USB Charging Cable Cord for Polar A360, A370, M400, M450, V700 Fitness Tracker : Electronics
Amazon.com: BoxWave Cable Compatible with Polar M400 (Cable by BoxWave) - Micro USB DuraCable, Braided Micro USB Charging Cable for Polar M400 - Space Grey : Electronics
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Polar M400 Watch Repair - iFixit
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Polar M400 sync does not start in FlowSync. Now what? | Polar Global
Polar M400 User Manual | Caring for Your M400
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Polar M400 GPS Smart Sport Watch USB Cable Transfer Cord Replacement | eBay