MI BAND 4
Full colour AMOLED. touch display. View call, text, and. app notifications.
Activity and. swim tracking. Water resistant up to 50m*； 3-axis accelerometer, 3-axis gyroscope.
Up to 20 days. battery* A single charge lasts. up to 20 days.
Health. monitoring. 24/7 heart rate. monitoring. and sleep tracking.