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wearable devices monitors human activities through electronic sensors,and they are at the consumer electuonics level.it's normal for certain deviation.the user should treat data objectively. --please do not compared to hospital equipment about reading,it is not a medical device ! --before using, scan the qr code on the manual to download the app and connect it to the watch with app. --for android user: please always authorize app access to all phone functions and always let it operating on.