Apple Watch SE is a smart watch released by Apple on September 6, 2020/KLOC-0. It is divided into two versions: Wi-Fi and cellular. The starting price of China Bank is 2 199 yuan. Apple Watch SE has the same accelerometer, gyroscope and altimeter as Series 6, equipped with motion sensor and microphone, which can provide powerful health and safety assistance functions, support fall detection and advanced fitness functions.

Apple Watch SE has the same design as Apple Watch Series 4, the same screen size as Apple Watch Series 6, built-in S5 dual-core chip, supports compass, and adapts to watchOS7 system. The new Apple Watch SE is available in 40mm and 44mm specifications, with GPS and cellular versions.

The meaning of oxygen saturation:

Oxygen saturation refers to the volume ratio of oxygenated hemoglobin to effective hemoglobin. Generalized oxygen saturation often refers to the percentage of oxygen content in blood samples to the maximum oxygen content in blood samples. The metabolic process of human body is a biological oxidation process. Oxygen needed in the metabolic process enters human blood through the respiratory system, combines with hemoglobin in red blood cells to form oxygenated hemoglobin, and then is delivered to various tissues and cells of human body.

Blood oxygen saturation is the percentage of the capacity of oxygen-bound oxygenated hemoglobin in blood to the total capacity of bound hemoglobin, that is, the concentration of blood oxygen, which is an important physiological parameter of respiratory cycle. Functional oxygen saturation is the ratio of HbO2 concentration to HbO2 plus Hb concentration, which is different from the percentage of oxygenated hemoglobin.