Hands-on: Polar's M430 GPS watch with optical HR | DC Rainmaker
Polar's new M430 flagship running watch has wrist-based heart rate sensors - The Verge
Polar M430 GPS HRM Watch Review - Believe in the Run
Polar M400 Black HR | bol.com
Polar - Extremes are easy. To help strike the right balance between rest, recovery and training—Polar M400 owners can now check out their training load, and recovery status, on Polar Flow. http://updates.polar.com/
POLAR M400 GPS Watch with HRM - Eastern Mountain Sports
A look at the new Polar Beat Bluetooth Smart app with H7 Heart Rate Strap | DC Rainmaker