Feature: 1. Screen Display: 1.62" screen with 192×490px resolution, max brightness 1200nit, oval shape touch screen, 60Hz refresh rate, wet hand anti-misoperation function 2. Sports Modes: Over 150 sports modes, including running courses, boxing courses, dance courses, and automatic detection for walking, running, cycling, skipping, elliptical, and rowing 3. Health Monitoring: 24/7 heart rate, and stress monitoring, sleep analysis with suggestions, sleep rhythm screening, sleep apnea screening, female cycle reminder, breathing training 4. Battery Life: 233mAh Li-ion polymer battery, 21 days in typical mode, 9 days in AOD mode, 60 minutes charging time 5. Connectivity: BT 5.4, compatible with Android 8.0+/iOS 12.0+ devices 6. Smart Features: Music control (partially supported), alarm, timer, stopwatch, flashlight, weather (Xiaomi/Redmi phones only), to-do reminders, offline payment, find phone, world clock, spring egg clock, remote photo taking (partially supported), fusion device center (partially supported on Xiaomi/Redmi phones), Mi Home support 7. Water Resistance: 5ATM water resistance, suitable for swimming 8. Sensors: Accelerometer, gyroscope, optical heart rate and ambient light sensor Specification: Material: TPU wristbandWristband Length: Adjustable from 135mm to 210mm / 5.3in to 8.3inWater Resistance: 5ATMSensors: Accelerometer, gyroscope, optical heart rate and ambient light sensorScreen: 1.62" screen, 192×490px resolution, max brightness 1200nit, oval shape touch screen, 60Hz refresh rate, wet hand anti-misoperation functionBattery: 233mAh Li-ion polymer battery, 21 days in typical mode, 9 days in AOD mode, 60 minutes charging timeConnectivity: BT 5.4, compatible with Android 8.0+/iOS 12.0+ devices, Health Features: 24/7 heart rate, and stress monitoring, sleep analysis with suggestions, sleep rhythm screening, sleep apnea screening, female cycle reminder, breathing trainingSports Modes: Over 150 sports modes, including running courses, boxing courses, dance courses, and automatic detection for walking, running, cycling, skipping, elliptical, and rowingSmart Features: Music control (partially supported), alarm, timer, stopwatch, flashlight, weather (Xiaomi/Redmi phones only), to-do reminders, offline payment, find phone, world clock, spring egg clock, remote photo taking (partially supported), fusion device center (partially supported on Xiaomi/Redmi phones), Mi Home supportSize: Approx. 46.53 x 21.63 x 10.95mm / 1.83 x 0.85 x 0.43inWeight: Approx. 15.8g / 0.56oz (without wristband) Package List: 1 x Xiaomi Smart Band 91 x Charging Cable1 x User Manual