Amazon.com: BoxWave Cable Compatible with Polar M400 (Cable by BoxWave) - DirectSync Cable, Durable Charge and Sync Cable for Polar M400 : Cell Phones & Accessories
Polar M400 Review | PCMag
Polar M400 sync does not start in FlowSync. Now what? | Polar Global
Best Buy: Polar M400 GPS Watch with Heart Rate Black 90051339
Maintenance of your M400 | Polar USA
Polar - Hey Polar M400 iOS users! Smart notifications have arrived! Keep up-to-date wherever you want, with notifications about incoming calls and messages sent straight to your wrist! How to activate smart
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Polar M430 review - Wareable
Polar M400 Review | PCMag
Can I get some help. My m400 wont charge, so cannot connect to flowsync app on PC. : r/Polarfitness