Umidigi - Not just in the expensive high-end smartwatch! To help as many people as possible pay attention to health, we make the new advanced SpO2 sensor and heart rate sensor in
Smartwatch vs Oximeter: How different SPO2 technologies work and which is more reliable - YouTube
Withings ScanWatch Horizon 43mm Smartwatch Wasserdicht 100m EKG- und SpO2- Sensor – Dunkelgrün - German