How is the ECG patch used? I want to buy one.

I used Riel's assured ECG patch, which I tried on for free in the hospital. Thank you for giving me this opportunity. I brought hellofit before, but I don't feel as good as the rest assured ECG sticker I am wearing now. It is very comfortable to wear Riel's reassuring ECG patch. You can see the heart rate and heart rate, and you can also analyze the report. In the future, there will be doctors stationed in the Riel Anxin APP, which is very good.