Mi Smart Band 4 Health Smart Watch – Black




The 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 differences in environment, use, and settings.

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; The 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. Also 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.




Weight   22.1g


Water Resistance Rating  5 ATM


Display Type  AMOLED


Screen Size  0.95″


Resolution  120 x 240 RGB


Colour Depth  24bit


Screen Brightness  Up to 400 nits (max brightness), brightness adjustable


Touchscreen type  On-cell capacitive touchscreen


Screen protection  2.5D tempered glass with anti-fingerprint coating


Button  Single touch button (wake up, go back)


Wrist strap type  Removable wrist strap

(Mi Smart Band 4 is compatible with Mi Band 3 straps)


Wristband width  18mm


Wrist strap material Thermoplastic polyurethane


Adjustable wrist strap length  155-216mm






Sensors 3-axis accelerometer + 3-axis gyroscope;

PPG heart rate sensor;

Capacitive proximity sensor


Wireless connectivity  BT5.0 BLE


Battery  LiPo, 135mAh


Charging Type  2Pin Pogo Pin


Charging time ≤ 2 hours


Standby time Up to 20 days


Motor Type Rotor


Body material polycarbonate


AppMi Fit


System requirements Android 4.4, iOS 9.0 or above




Sport Functions6 workout modes: Treadmill, exercise, outdoor running,

cycling, walking, pool swimming; Count steps, distance,

and calories burned


Health monitoring workout completion notifications, goal setting, sleep monitoring,

heart rate monitoring, all-day heart rate checking, resting

heart rate, heart rate chart, idle alerts


Other featuresAlarm, proximity sensor, pre-set watch face, customizable watch face,

lock screen, timer, stopwatch, phone alarm, and notifications, incoming

calls, message notifications, calendar notifications, app notifications,

weather forecast, Find my phone, phone unlock, event notification,

Night mode, Do not disturb mode (works even without phone), music

controls on band, Bluetooth broadcasting, battery level display, different

ways to wear, OTA updates


Package contents

Mi Smart Band 4 X 1

Wrist strap X 1

Specialized charging cable X 1

User guide X 1


















Additional information




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