Best ECG Blood Pressure Smartwatch. Best Ecg Smartwatch. Supports 24-hour monitoring of blood pressure, ECG, and heart rate. PPG and ECG smartwatch, Improve accuracy. Add friends to family members in the APP to remotely view the health data of each other. Larger RAM and FLASH, more function expansion; faster display speed, smoother browsing; brand-new CPU technology, lower power consumption, longer standby time.The pulse wave time difference method (PWTT) is far more accurate than pure optical measurement method, and blood oxygen is measured regularly, especially during sleep, to ensure that the blood oxygen is kept at a normal level at all times.