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 Cable, BoxWave® [Colorific Magnetic Mini Cable] Colorful Mini Micro USB Cable for Polar M400, A360, V650 - Cosmo Pink : Amazon.ca: Electronics