XIAOMI Smart Band 9 Fitness Tracker

1.62 AMOLED display for seamless interaction Automatic screen brightness adjustment and 1200nit Max brightness 60Hz high refresh rate, smooth usage Up 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 advice Improved 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 modes Professional 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.