Features Interchangeable strap shape 24-hour heart rate monitoring Wrap-around strap design USB charging cable Specifications Screen size: 0.96 inches Screen resolution: 160x80 Battery capacity: 90mAh Material: PC+silicon Bluetooth: 4.0 Waterproof grade: IP68 Functions: touch, step counting, calories, distance, heart rate, blood pressure, oxygenation, sleep, sport. -8 sports modes: walking, running, cycling, climbing, basketball, tennis, skipping, yoga