2.794cm AMOLED Screen - Intense colors, high resolution, and large dimensions make this AMOLED screen a treat for the eyes. Knowing you'll want to wear OPPO Band all the time, we've protected its screen with a curved layer of strengthened, scratch-resistant 2.5D glass. Continuous SpO2 Monitoring - The SpO2 sensor tracks the variability of oxygen levels in your blood. Continuous SpO2¹ can be monitored as you sleep, which can also provide you with sleep duration and sleep stage records. With better sleep, you'll wake up feeling rested and ready to take on the day.Real-Time Heart Rate Monitoring - If any abnormalities are detected, around-the-clock heart rate monitoring will remind you to proceed with caution by sending a vibrating alert. Whether you're at rest or pushing yourself for that last lap, you won't have to miss a beat.