3PCS Tempered Glass Clear Protective Film Guard For Polar M400 M430 SmartWatch Sport Watch Toughened Full Screen Protector Cover - AliExpress Consumer Electronics
Polar M400 Review - Fellrnr.com, Running tips
Actualización del firmware del Polar M400 - ElectronicaDeportiva.com
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
Can I get some help. My m400 wont charge, so cannot connect to flowsync app on PC. : r/Polarfitness
Polar - Updates for Flow app Android, M400 and V800 users: - Flow app Android release corrects the activity and training data visibility issue which some of you experienced - firmware updates