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if they are supervised or instructed regarding the safe use of the device and
understand the dangers that may arise. Children may not play with the device.
Cleaning and user maintenance of the device may not be performed by children
without supervision. Keep packaging films out of the hands of children. There is a
danger of suffocation.
Optical heart rate measuring
Your heart rate monitor watch measures your heart rate at your wrist using an
optical sensor. A chest belt is not required when using this method.
Blood circulation
Blood circulation varies from person to person and may differ intra-individually (for
example, between the left and right arms). In some cases, natural blood flow may
not be optimal for heart rate measurement with an optical sensor in certain
individuals.
Environmental factors
If the ambient temperature is too low, blood flow to the forearms can be reduced
and this may reduce measurement accuracy.
Skin Colour
Skin reflectivity is influenced by the colour of the skin surface. In principle, the less
light is absorbed through the skin surface, the better the heart rate measurement.
Strong pigmentation of the skin, scarring and tattooing can therefore adversely
affect the measurement accuracy.
Keep skin dry and clean
It is important to keep your watch and skin clean and dry. Dry will maximize comfort
and prevent damage to the watch. This is especially important during workouts or
exposure to liquids. Liquids such as sweat, soap, sunscreen, and lotions can reduce
measurement accuracy.
Posture
Improper posture (such as sharply bent wrists) will affect the circulation of the
forearms and reduce heart rate measurement accuracy.
93


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