Keep an Eye on Your Heart Rate All-Day. Band 5 performs 24/7 high-precision monitoring of your heart rate and high heart rate warning. Measure Your Blood Oxygen Level Any Time, Anywhere When you feel unwell, measure your blood oxygen saturation and understand your physical state. Measure Your Stress Level and Control It. Check your personal stress level -relaxed, normal, medium or high- anytime you feel pressured or stressed Keep Track of Your Menstrual Cycle. Amazfit Band 5 can help you keep track of your menstrual cycles and ovulation periods, and alert you before they arrive. One Single Score to Understand Your Global Physical Health. Huami-PAI converts big data on heart rate, daily activities, and other health statistics into one single and intuitive numerical score for you to understand your daily exercise status and global health in a more concise and precise way. Monitor Your Sleep Quality, As Well As Your Daily Naps. Amazfit Band 5 professionally interprets the sleep characteristics at each stage and analyze sleep quality