Best Buy: Polar M400 GPS Watch with Heart Rate Black 90051339
Polar M400 Running Watch Bluetooth GPS Activity Tracking White | eBay
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Amazon.com: BoxWave Cable Compatible with Polar M400 (Cable by BoxWave) - Micro USB DuraCable, Braided Micro USB Charging Cable for Polar M400 - Space Grey : Electronics