NEW Micro USB Charger Charging Power Cable Lead For Polar M400 GPS Sports Watch | 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
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Polar M400 User Manual
Hellfire Trading USB Charger Power Cable Lead for Polar M400 GPS Sports Watch | Fruugo TR