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l Do you use a pacemaker or other implanted electronic device?
l Do you smoke?
l Are you pregnant?
Note that in addition to training intensity, medications for heart conditions, blood pressure, psychological con-
ditions, asthma, breathing, etc., as well as some energy drinks, alcohol, and nicotine may also affect heart
rate.
It is important to be sensitive to your body’s responses during training. If you feel unexpected pain or
excessive fatigue when training, it is recommended that you stop the training or continue at a lighter
intensity.
Note! If you are using a pacemaker, defibrillator or other implanted electronic device, you can use Polar
products. In theory interference to pacemaker caused by Polar products should not be possible. In practice no
reports exist to suggest anyone ever having experienced interference. We cannot however issue an official
guarantee on our products’ suitability with all pacemakers or other implanted devices, such as defibrillators,
due to the variety of devices available. If you have any doubts, or if you experience any unusual sensations
while using Polar products, please consult your physician or contact the implanted electronic device man-
ufacturer to determine safety in your case.
If you are allergic to any substance that comes into contact with your skin or if you suspect an allergic reaction
due to using the product, check the listed materials in Technical Specifications. To avoid any skin reaction to
the heart rate sensor, wear it over a shirt, but moisten the shirt well under the electrodes to ensure flawless
operation.
The combined impact of moisture and intense abrasion may cause a black color to come off the heart rate
sensor’s surface, possibly staining light-colored clothes. If you use perfume or insect repellent on your skin,
you must ensure that it does not come into contact with the training device or the heart rate sensor.
TECHNICAL SPECIFICATION
A300
Battery type: 68 mAh Li-pol rechargeable battery
Operating time: Up to 26 days with 24/7 activity tracking
and 1h/day training
Operating temperature: -10 °C to +50 °C / 14 °F to 122 °F
Training computer materials: Device: acrylonitrile butadiene styrene,
glass fiber, polycarbonate, stainless