Why the heart rate monitor not indicate immediately？ Some buyer will ask why I cannot get the heart rate monitor to work? We will make explain,bpm is indicated heart rate and mmHg is indicated blood pressure We use a green light sensor, in principle, when the skin contact with the sensor on the bracelet will be issued a beam of green light to hit the skin and to check the blood flow through the hand. When the heart beat, if the blood flow increases,the absorption of green light will increase,but heartbeat interval will be reduced. So it must be measured for a period of time to give relatively accurate data,if the data indicate immediately that errors will much more bigger.That's why will delay to indicate on the watch,but the data can be indicated immediately on the APP. How long does the battery last? 1.If you didn't open any function on App,the battery last 7-10 days 2.If only open some function on App,the battery can last 5-6 days 3.If open all the function on the App,like Heart Rate Monitor,Activity Tracker,Sleep Monitor and Alarm,Sedentary Reminder and Other functions,the battery can last about 4days Function instructions: 1.Notification Alerts - Alarm alert, call alert, sedentary alert, etc, by silent vibration2.Multiple motion mode - Running, swimming, basketball, badminton, etc3. Compatibility - Compatible with Android 4.4 and above, IOS 7.1 and above. For Samsung, Apple, Note 5, S7, S6, S5, iPhone 5 / 6 / 7 S Plus and so on. Package Included: 1*smart bracelet 1*user manual 2*charging cable1*packing box
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