Widgets and features32• The accuracy of the heart rate sensor may be diminished depending onmeasurement conditions and surroundings.• Use the HR feature only for measuring your heart rate.• Do not look directly at the heart rate sensor’s lights. Doing so may impair yourvision. Make sure children do not look directly at the lights.• Cold ambient temperatures may affect your measurement; during winter or coldweather, keep yourself warm when checking your heart rate.• Take heart rate measurements when you are seated and relaxed. Do not move yourbody while taking heart rate measurements. Doing so may cause your heart rate tobe recorded inaccurately.• If you receive a reading that is very different from your expected heart rate, restand then measure again.• Smoking or consuming alcohol before taking measurements may cause your heartrate to be different from your normal heart rate.• Do not talk, yawn, or breathe deeply while taking heart rate measurements. Doingso may cause your heart rate to be recorded inaccurately.• Because the heart rate sensor uses light to approximate heart rate, its accuracymay vary due to physical factors that affect light absorption and reflection, such asblood circulation/blood pressure, skin condition and location and concentration ofblood vessels. In addition, if your heart rate is extremely high or low, measurementsmay be inaccurate.• Users with thin wrists may receive inaccurate heart rate measurements whenthe device is loose, causing the light to be reflected unevenly. If heart ratemeasurement is not working properly, adjust the position of the device’s heart ratesensor to the right, left, up, or down on your wrist, or turn the device so the heartrate sensor sits firmly against the inside of your wrist.• If the heart rate sensor is dirty, wipe the sensor and try again. Obstructionsbetween the device’s band and your wrist, such as body hair, dirt, or other objectsmay prevent the light from reflecting evenly. Please make sure you remove suchobstructions before use.• If your device becomes hot to the touch, please remove it until it cools. Exposingskin to a hot surface of the device for a long time may cause skin burn.