Dal sito polar, notizia di oggi
http://updates.polar.com/tag/polar-m400/
Your Polar device is your daily companion and it also needs love and care just as the rest of us. It bears with you through all those obstacles that come your way and pushes you to your limits so it’s more than fair to give your Polar some TLC every once in a while.
Rinse and dry your product*, especially the USB port, after every training session to keep it clean from sweat, salt water and dirt. No need to worry, since the USB port itself is water resistant and you can rinse it under running water without worrying it would damage the electronic components. Remember not to charge or synchronize your Polar device when it is still wet. This also applies after a sweaty training session when there still might be some moisture on the surface of the device.
To make sure the device is dry, shake off the extra water from the USB area, dry it with a cloth and leave it to dry with the USB cap open to ensure that also the moisture from the USB area will dry up. Drying times vary depending on the environment (humidity etc.) and in very humid conditions it might take hours to completely dry up. Before syncing, it’s good to double check the USB port is dry and there’s no dust,dirt or even hair in the connector cavity.
You can find detailed care instructions for your device from here.
*excluding our cycling products and the RC3 GPS (IPX7)
Product_TLC
Oh, and don’t forget that heart rate strap! Did you know you should remove the sensor from the strap and rinse the strap after every use! You should also wash it regularly with a mild soap to lengthen its lifespan.