The principle of the CMS50DL button is as follows: the inspection technology of the photoelectric oxymoglobin is adopted in accordance with the scan technology and recording of capacity impulses, the pulse oximeter can be used to measure the saturation of oxygen and the frequency of the wrist through the finger. Used in the family, hospital, oxygen bar, health care in community, physical assistance in sports (it can be used before or after sport and it is not advisable to use the device during the sports process), etc. ■ integrated with SpO2 probe and processing display module ■ The operation of the product is simple, low energy consumption ■ Viewing the value of the wrist frequency, display of the Istogramm ■ Low voltage indication: the low voltage indicator appears before working abnorma.