Xiaomi Smart Band 9 - Midnight Black Colorful metallic frame with multi-scenario accessories • Aluminum alloy sandblasted frame, five colors and colorful color matching • Multi-material wrist strap accessories, one click quick disassembly 1.62'' AMOLED display for seamless interaction • Automatic screen brightness adjustment and 1200nit Max brightness • 60Hzhigh refresh rate, smooth usage Up to 21-day battery life • Upto21-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 SpO₂ monitoring • Upgraded high-precision sensor to increase heart rate accuracy by 10% Watch level fine vibration • Upgraded linear motor • 20original 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. Support Accessories to Wear Band in a New Way • Running clip could help to wear band on shoes to record professional running data. • Pendant accessory help to wear band on necklace to show special watch faces.