Amazon.com: BoxWave Cable Compatible with Polar M400 - Micro USB Keychain Charger, Key Ring Micro USB Cable - Jet Black : Electronics
Amazon.com: Osuner Silicone Replacement Watch Strap, Compatible for Polar M400 / M430, Breathable and Comfortable Watch Replacement Band with Tool : Cell Phones & Accessories
Amazon.com: Weinisite Watch Band for Polar M400/Polar M430 Watch Band,Replacement Soft Silicone Band For M400/Polar M430 Sport Watch (Black) : Cell Phones & Accessories