StavrosMeL on Twitter: "Suddenly, my Polar M400 lost all of its contrast! Contacted the national office and told me to send it over and they'll give me an estimation (€€!!) @PolarGlobal are
How to Change Physical Settings in POLAR M430 - YouTube
How to do a hard reset on POLAR Vantage M? - HardReset.info
PolarGlobal on Twitter: "@MarcDeuter Hi Marc. Please make a factory reset to your M400. It should help. https://t.co/10CJRbb185 If still issues, your local Polar helps at https://t.co/k9QIKDpdCT" / Twitter
My polar m400 says something went... - Dawn Melohn Davis | Facebook