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Taking Care of Your A300

Like any electronic device, Polar A300 should be treated with care. The suggestions below will help you fulfill guarantee obligations and enjoy this product for many years to come.


Keep your training device clean.

  • We recommend that you wash the device and the silicone wristband after each training session under running water with a mild soap and water solution. Please remove the device from the wristband and wash them separately. Wipe them dry with a soft towel. Don't charge the device when it is wet.

    It is essential that you wash the device and the wristband if you wear them in a swimming pool where chlorine is used for keeping the pool clean.

  • If you don't wear the device 24/7, wipe off any moisture before storing it. Don't store in non-breathable material or in a damp environment, e.g. plastic bag or damp gym bag.
  • Wipe it dry with a soft towel when needed. Use a damp paper towel to wipe dirt from the training device. To maintain the water resistance, do not wash the training device with a pressure washer. Never use alcohol or any abrasive material such as steel wool or cleaning chemicals.
  • When you connect your A300 to a computer, check that there is no moisture, hair, dust or dirt on the A300's USB connector. Gently wipe off any dirt or moisture. Don't use any sharp tools for cleaning to avoid scratching.

Operating temperatures are -10 °C to +50 °C / +14 °F to +122 °F.

Heart rate sensor

Connector: Detach the connector from the strap after every use and dry the connector with a soft towel. Clean the connector with a mild soap and water solution when needed. Never use alcohol or any abrasive material (e.g. steel wool or cleaning chemicals).

Strap: Rinse the strap under running water after every use and hang to dry. Clean the strap gently with a mild soap and water solution when needed. Do not use moisturizing soaps, because they can leave residue on the strap. Do not soak, iron, dry clean or bleach the strap. Do not stretch the strap or bend the electrode areas sharply.

Check the washing instructions on the label of the strap.


Keep your training device and heart rate sensor in a cool and dry place. Do not keep them in a damp environment, in non-breathable material (a plastic bag or a sports bag) nor with conductive material (a wet towel). Do not expose the training device to direct sunlight for extended periods, such as by leaving it in a car or mounted on the bike mount.

It is recommended to store the training device partially or fully charged. The battery slowly loses its charge when it is stored. If you are going to store the training device for several months, it is recommended to recharge it after a few months. This will prolong the battery lifetime.

Dry and store the strap and the connector separately to maximize the heart rate sensor battery lifetime. Keep the heart rate sensor in a cool and dry place. To prevent snap oxidation, do not store the heart rate sensor wet in non-breathing material, such as a sports bag. Do not expose the heart rate sensor to direct sunlight for extended periods.


During the two-year guarantee/warranty period we recommend that you have service done by an authorized Polar Service Center only. The warranty does not cover damage or consequential damage caused by service not authorized by Polar Electro. For further information, see Limited International Polar Guarantee.

For contact information and all Polar Service Center addresses, visit and country-specific websites.

Register your Polar product at to ensure we can keep improving our products and services to better meet your needs. For the registration you need a Polar account which you have created when taking your device into use via web. The username for your Polar Account is always your email address. The same username and password are valid for Polar product registration, Polar Flow web service and app, Polar discussion forum and newsletter registration.