I got the Chinese edition, set for release in 2022. In 2022, when used with an iPhone, it's fantastic. Recruited Expertise: Integral pulse oximeter validated by medical devices. The accuracy is good, with a margin of error of only 1% to 2%. The negatives: Resting-only oxygen sensor. Driving-related blood-oxygen levels are not shown. The iOS app does not support adding new screens. Those that come standard are horrible.
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