Amazon.com: FITVII Slim Fitness Tracker with Blood Oxygen 。?Dress you up! A design combining jewelry and a fitness tracker. Take straps in different styles and colors. Find the style that moves you. ?24/7 Blood Pressure & Heart Rate: Understand your resting heart rate and blood pressure trends with FITVII 24/7 Heart rate and blood pressure monitoring watch. Provide data support for your exercise planning. (Only for encouraging a healthy lifestyle, not for medical use) ?Blood Oxygen: FITVII slim fitness tracker can measure your blood oxygen saturation and help you understand your physical state. Great for high-intensity workouts and sports like marathons and gym workouts. ?Sleep Tracking: Better sleep can power your days. Track your time in light and deep sleep to better understand your sleep quality each night. ?Track all-day activity: Your steps, distance, and calories burned will automatically count and record. ?Smart Functions: An easy-to-use activity fitness tracker with 7 sports modes and various intelligent features. DIY watch face, call and message notifications, weather, drinking and sedentary reminder, alarm clock, music control, and female menstruation period reminder. ?Compatibility: FITVII Slim Fitness tracker is compatible with Android 5.0 & iOS 10 and above smartphones with Bluetooth 4.0, but is not compatible with PC, iPad, or Tablet. One full charge gives up to 7-10 days of working time. (Varies with use and other factors)