There is no oxygen saturation sensor. But in principle, he cannot give an accurate picture, only an approximate understanding. Got pros: The duration of 30 days is the best indicator. This duration of work is achieved due to the transflective display, it does not need backlighting in the daytime, so the battery charge is not wasted on it. Has some cons Transflective display, it is also a disadvantage, but only in terms of the visual component. The color saturation is low, as is the resolution.
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