What are the precautions for blood oxygen monitoring on the Xiaomi Smart Band 9 Pro?

The precautions for blood oxygen monitoring on the Xiaomi Smart Band 9 Pro are listed below:
1. When the blood oxygen is measuring, the red light and infrared light at the bottom of the band will be turned on. If the green light is blinking, the heart rate is being measured;
2. Some of the band displays support displaying oxygen blood. You need to manually switch the watch faces, however, not all of the band displays can display blood oxygen. You can download the band display in the Mi Fitness APP;
3. The Xiaomi Smart Band 9 Pro supports blood oxygen alerts in the options of 80%, 85%, 90% and Off. The measured values are for reference only and are not intended for medical reference or diagnosis. If you feel any discomfort, please consult a medical institution.