lt;p>Used but works great </p>
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Polar M400 with heart rate sensor review - The Gadgeteer
Polar M400 GPS Sports Watch without Heart Rate Monitor, Black : : Electronics
Used Polar M400 GPS Fitness and Heart Rate Monitor Bundle - Black
Polar M400 Activity Trackers
Polar M400 Activity Trackers
Polar GPS & Running Watches Running & Jogging for sale
Weinisite Watch Band for Polar M400/Polar M430Replacement Soft Silicone Band for M400/Polar M430 Sport Watch
Polar M400 Activity Trackers
Polar M400 GPS Watch with Heart Rate Monitor - Black for sale online
Polar M400 review
Polar M400 Review, Detailed, Discount Links
Polar Gritpolar M400/m430 Silicone Watch Band - Breathable Replacement Strap With Tools