Huawei watch oxygen saturation is medical grade

Huawei watch oxygen saturation is medical grade as follows, according to biological principles, the oxygenated hemoglobin in the blood absorbs more red light and less infrared light; while hemoglobin absorbs more infrared light and less red light. It can be measured with our common medical testing devices such as finger-clip type of transmission oximeters. Then, according to this principle, people can invent the blood oxygen sensor, and the blood oxygen sensor chip used in the smart bracelet is reflective, there are two light-emitting diodes in the chip, respectively, the wavelength of 669nm red light and 880nm infrared light to the wrist, the other side of the photodiode will be used to receive the reflected light, through the difference between the light intensity of the emission and the reception of the saturation of blood oxygen can be calculated.