Often referred to as SpO2 sensors on wearable devices, they are used to measure blood oxygen levels or oxygen saturation in the blood.
The characteristics of the sensor include miniaturization, digitization, intelligence, multifunctionality, systemization, and networking.
It is the primary link in the realization of automatic detection and automatic control. The existence and development of sensors allow objects to have senses such as touch, taste and smell, so that objects slowly become alive.