Amazon.com: BoxWave Cable Compatible with Polar M400 (Cable by BoxWave) - DirectSync Cable, Durable Charge and Sync Cable for Polar M400 : Cell Phones & Accessories
Silicone Wrist Strap Replacement For Polar M430 Gps Running Smart Sport Watch Band With Tools Wristband For Polar M400 Bracelet - Smart Accessories - AliExpress