B57 Smartwatch Features: 1. Bracelet display function: time display, battery icon display, date display, week display, standard motion function (step, distance, calorie) multi-sport mode (walking, running, cycling, skipping, badminton, basketball) , football, swimming), heart rate, blood pressure detection, blood oxygen detection, sleep time display, screen brightness adjustment, music control. 2. Reminder function: incoming call, SMS, QQ, WeChat reminder (display content and name). Facebook, Whatsapp, Twitter, Skype, and other foreign social software reminders, alarm clocks (three sets of alarm clocks), sedentary reminders. 3. Other functions: intelligent anti-lost, remote control photography, do not disturb mode, raise hand to bright screen, time format setting, factory reset, long press to reject incoming calls, three clock interface selection, music control (support previous song, next song, play/pause), weather display, apple health, etc. Y68/D20 Smartwatch Function: 1. Bracelet function: Heart rate, blood pressure, blood oxygen, pedometer, calories, information reminder, sedentary reminder,Facebook, Twitter, sleep monitoring, remote control camera, intelligent anti-loss, looking for bracelet, lifting hand bright screen. **The product can't be used for deep diving and long-term soaking in water. In addition, this product is not resistant to hot water, because water vapor will affect the hand ring. Packing list 1* Smart Watch 1* Instruction Manual 1* Charging Cable. Tips: 1. Please charge before use! 2. Do not use the smart bracelet in sea water, hot water or warm water! 3. Don't wear this device when bathing or swimming for a long time. 4.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.