As we all know, many years ago, Apple first introduced a brand-new electrocardiogram detection function (ECG) into Apple Watch 4, but users in Chinese mainland have been unable to use it. The main reason is that ECG is a function of medical devices, which requires equipment registration and medical device management in Chinese mainland. With the upgrade of watchOS 8.3RC version, the ECG function can be officially enabled, which means that Apple has finally passed the approval of ECG function, and Apple Watch can be regarded as a medical device.