The detection of blood oxygen saturation plays an important role in the monitoring of COVID-19 and severe conditions. COVID-19 will lead to lung infection, thus reducing the content of blood oxygen saturation, which is an important basic vital indicator parameter to measure the ability of blood to combine oxygen with epoxy.

When the blood oxygen saturation level is low, one may feel fatigue and shortness of breath, sometimes even without any discomfort. Through blood oxygen testing, we can real-time understand our physical condition and be alert to 'silent hypoxia'.