Reinvent your lifestyle with the M4 Smart Digital Health and Fitness Tracker Bracelet. Record your daily walk, distance, and calorie consumption. Automatic monitor your sleep quality and get a silent vibration alarm to wake you up. With a precision optical sensor, the heart rate detector monitors your heart rate status in real time 24 hours a day and helps users formulate a suitable exercise plan to automatically measure heart rate in hours. View your weekly health report with graphs and analyze your walking distance, sleep quality, heart rate, blood pressure, blood oxygen, and fatigue index.