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Get a wider, more colourful view right on your wrist.
The all-new full colour AMOLED touch display that’s 39.9% larger* and brighter than ever before.
Instantly view call, text, app notifications and music in play. Keep your hands free as you keep up with life.Sleep monitoring
Accurately tracks light and deep sleep as well as heart rate during sleep to help you adjust your sleep patterns.Wristband alarm
A light vibration gently wakes youup for a more comfortable morning.Mi Fit app
Records your health data to help you get the most out of life.24/7 Heart rate monitoring
Safeguard your health at all times. Alerts you when your heart rate is too high.Idle alerts
Stay active as you get reminders to get up and get moving.* Water resistant up to 50m. Water resistance is in accordance with GB/T 30106-2013 standard. Testing performed by the National Quality Supervision and Inspection Center for Watches. Mi Smart Band 4 water resistance report code: QT1902005;* Mi Smart Band 4 lasts up to 20 days on a single charge according to Huami Laboratory testing: Tested using default settings, with 30 minute automatic heart rate monitoring enabled, receiving 100 notifications per day, 2 alarms per day, vibrating for 5 minutes, touching the touch button 10 times per day, and syncing with the app once per day. Actual results may differ due to to differences in environment, use and settings.* "39.9% larger display size" is in comparison to Mi Band 3. Mi Band 3's display measures 17.26mm in length and 9.66mm in width. Mi Smart Band 4 measures 21.6mm in length and 10.8mm in width. Calculated as (10.8*21.6-9.66*17.26) / (9.66*17.26), the Mi Smart Band 4's display is 39.9% larger than Mi Band 3's display.* Images are for reference only, font may be slightly different from actual product.