Xiaomi Smart Band 9 - Midnight Black

1.62" AMOLED display for seamless interaction• Automatic screen brightness adjustment and 1200nit Max brightness• 60Hz high refresh rate, smooth usageUp to 21-day battery life• Up to 21-days battery life for normal daily use.• Fully charged within 1 hour.Upgraded all-round sleep monitoring• Sleep monitoring function professional upgrade• Record sleep data and give professional adviceImproved heart rate and SpO? monitoring• Upgraded high-precision sensor to increase heart rate accuracy by 10%Watch level fine vibration• Upgraded linear motor• 20 original vibration modesProfessional Workout Analysis• 150+ workout modes to record your heart rate and burned calories.• 10 on-wrist running courses, could vibrate and light the screen to remind you to meet your heart rate and pace goals.