The China line AppleWatch already supports ECG ECG test function, as early as many years ago Apple first introduced the new ECG test function in AppleWatch4, but mainland China users have not been able to use, the main reason is because the ECG function belongs to the medical device function, which requires the device to be registered and pass the China The main reason is that the ECG function is a medical device function, which requires the device to be registered and pass the medical device management in mainland China.