Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Pulsometer Polar M400 HR White z GPS | R-GOL.com - Football boots & equipment
Best Buy: Polar M400 GPS Watch with Heart Rate Black 90051339
Polar - Not only a color, but a state of mind! For those of you who fancy a little splash of color to brighten up your day. Polar M400 is now available
Polar M400 with heart rate sensor review - The Gadgeteer
Training with the Polar M400 Heart Rate Monitor
Polar M400 GPS Fitness and Heart Rate Monitor Bundle - Black | REI Co-op