Bluetooth SynchronizationWith Bluetooth 4.1, this smart bracelet is available for smartphones with Bluetooth function- Professional 24H-continuous Heart Rate DetectionWhether you are resting or doing sports, detect your heart rate accurately- Intelligent Anti-lostWatch will send an alarm after leaving the mobile phone in a certain distance, no need to worry about losing your phone- Sport MonitorThis smart bracelet can record steps, calories and distance, so you can know your sports data,adjust your exercise program and live a healthier life- Sleep MonitorAccurately monitor total effective sleeping time and motion time every night, helping you develop good living habits- Sedentary ReminderDevelop scientific habits and effectively resist sub-health