Use notiction:Portable devices monitor human activities through electronic sensors, and they are at the consumer's electronic level. It is normal for certain deviations. The user must treat the data objectively.Please do not compare to hospital equipment about reading, it is not a medical device!Before using, scan the QR code on the manual to download the application and connect it to the watch with the application.For Android users: please always allow access to all phone functions and let it work. And please turn on your phone's GPS before connecting it.Please charge it for 2-3 hours when you receive it. He ran out of power after the long delivery. Thank you! Function:Heart Rate TrackingArterial pressureBlood oxygenPassometerSports moderator: walks, skiipping, situpSleep MonitorCaloriesPush messageCall reminderAlarm clockAnti-lossRemote controlSocial Media NotificationsMessage reminder Application language: Korean, Russian, Spanish, English, German, Italian, Japanese, French, Chinese