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
USB cable for Polar RC3, A370, A360, M400 usb charging cord - 1m | eBay
Amazon.com: BoxWave Cable Compatible with Polar M400 (Cable by BoxWave) - Micro USB Keychain Charger, Key Ring Micro USB Cable for Polar M400 - Jet Black : Electronics
ReadyWired USB Charging Cable Cord for Polar A360, M400 Fitness Tracker - Walmart.com
For Polar M400, M450, A360, A370, V700 Sports Watch USB Data/Charger Cable - Walmart.com
Polar M400 sync does not start in FlowSync. Now what? | Polar Global