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
USB cable for Polar RC3, A370, A360, M400 usb charging cord - 1m | eBay
Polar M400 User Manual
Polar - Not only a color, but a state of mind! For those of you who fancy a little splash of color to brighten up your day. Polar M400 is now available
Polar M400 | Analysis, full test and opinion
Polar M400 User Manual | Caring for Your M400
Polar M400 | Watches | wiggle.com
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET