USB cable for Polar RC3, A370, A360, M400 usb charging cord - 1m | eBay
ReadyWired USB Charging Cable Cord for Polar A360, M400 Fitness Tracker - Walmart.com
Polar M400 User Manual | Caring for Your M400
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
For Polar M400, M450, A360, A370, V700 Sports Watch USB Data/Charger Cable - Walmart.com
TUSITA Charger Compatible with Polar M430 GPS Watch - USB Charging Cable 100cm - GPS Smartwatch Accessories
Polar M400 User Manual | Caring for Your M400
Polar M400 with heart rate sensor review - The Gadgeteer
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET