Hero Iand For Polar M430 Watch Band Strap Soft Silicone Replacement Wrist Strap for Polar M400 Watchband With Tool for M430|Smart Accessories| - AliExpress
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Polar M400 GPS Watch - Walmart.com
Amazon.com: BoxWave Cable Compatible with Polar M400 (Cable by BoxWave) - Micro USB DuraCable, Braided Micro USB Charging Cable for Polar M400 - Space Grey : Cell Phones & Accessories