Polar M400: GPS Watch Review

The Polar M400 is part activity tracker and part GPS running watch.

Polar M400 Review - , Running tips

Polar M400 Review

Polar M400 Review Tested by GearLab

Polar M400 Review

Polar M400 - with heart rate sensor - GPS watch

Polar M400 - With heart rate sensor - GPS watch - cycle, running

Polar M400 Review: Can I Bin The Garmin Yet? (Dreaming of Footpaths)

Polar M400 Review: Fitness/Sleep Tracker Watch With GPS

Used Polar M400 GPS Fitness and Heart Rate Monitor Bundle - Black

Polar M400 Sports Watch and GPS Review Philippines

Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET

Polar launches M400 combined GPS watch and activity tracker + video