SwissOne SW 380 HR, Инструкция по эксплуатации

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Note! Opening the switch History record increases the
power consumption and it drains the batteries quicker.
Measuring results
When measuring heart rate, the green light on the
bottom flash through the contact with the wrist
on the blood vessels and reflect the waveform of
the blood flow to the two sensors.
By the optical changes of the light pulses which
measure the blood flow, data can be collected
and calculated. which are converted into the
measurement result on the screen.