Polar - #TeamPolar, we've got a bunch of updates for you: - M400 and V800 firmware - Flow web service - Flow app iOS And the icing on the cake: Flow app
Polar M400 | Analysis, full test and opinion
Polar M400 User Manual
Polar M400 Sports Watch (Blue) 90057183 B&H Photo Video
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Polar M400 review | TechRadar
Track Your Workout Like a Pro Athlete With This Fancy Smartwatch | WIRED
Polar M400 review: A feature-packed GPS running watch that can also track your steps and sleep - CNET
Polar Flow App | Get Started - YouTube
Polar M400 with heart rate sensor review - The Gadgeteer