It can be caused by the wearing style, skin color, hair, reduced blood perfusion, vasoconstriction at low temperatures, or dirt or water stains between the watch and the wrist. Restart measurement according to the blood oxygen instructions.
Factors such as wearing status, skin characteristics, environment, etc. may affect test accuracy or even measurement failure. This product is not a medical device and the results are for reference only and are not used as a basis for diagnosis and treatment.
Measurement instructions: 1. Wear the device to one finger distance from the wrist bone;
2. Wear it tightly and keep still during the measurement.
At the same time, Engineers are also trying to optimize the solution. Please wait for subsequent upgrades and updates.