MI Band 4

Wearables and its penetration in our market have been extraordinary. WIth the likes of MI & Honor offering tons of features at rock bottom prices, it’s highly lucrative. And here is MI with a new band in its series, MI Band 4, as a successor of the highly acclaimed previous model, MI Band 3. I got it as an upgrade to both MI Band 3 & Honor Band 4. We already discussed MI Band 4’s unboxing and initial views in the last article. Now, we will go on with an in-depth review of MI Band 4.

As usual, the review is also going to be a detailed one. So grab some popcorn & enjoy it. Get all your queries answered here and if anythings left, feel free to comment here or on my abstractotech channel or you can contact me directly.


This is the index to the MI Band 4 review. You can check the content here and skip directly to the section of interest.

A) Initial views, Inbox, About device, Pros, Co
B) Features as an activity tracker, Other features
C) Initial Setup, General gestures
D) Step counting (pedometer), Heart rate sensing, Sleep tracking
E) Notifications & message threads, MI Fit & Google Fit app, Music control, Weather, Bluetooth
F) Watch faces & How to set custom watch face, Battery life, Screen Guard, Firmware update
G) MIB4 vs MIB3, MIB4 vs HB4, MIB4 vs HB5, Verdict


Before starting our in-depth review of MI Band 4let us check out the contents of the package. Here inside Saffron-Black-White themed box, we get:

  1. MI Band 4 capsule
  2. Black wrist strap
  3. Charging cradle with pogo pins & fixed USB cable (6 inches long)
  4. Mini user guide


So its time to start our MI Band 4 review with some details about the device and overall rating of the device wrt few parameters.

  • Weight: 22g, Capsule: 12g
  • Screen: 0.95″ Color AMOLED touch screen with 120 x 240 pixels, 400 nits
  • RAM/ROM: 512 KB/ 16MB
  • Touch button: wake up or go back
  • Sensors: 3 axis accelerometer, 3 axis gyroscope, PPG heart rate sensor, capacitive proximity sensor
  • Bluetooth: v5.0 (BLE)
  • Battery: 135 mAh LiPo
  1. Screen 10/10 (+1 for sunlight legibility)
  2. Battery 9/10 (backup details below)
  3. Performance 9/10
  4. Build 10/10
  5. Sensors 9/10
  6. BT Range 10/10 (approx 40-50 ft, with no walls in b/w)
  7. Charging System 7/10 (inconvenient to remove capsule every time to charge it)

▶ Overall: 9.1 which translates to 4.55 star, so a 5 ★★★★★ device


This review of MI Band 4 will be incomplete without the set of the plus points of the device. There are a few minus points too, but plus ones are quite a lot to balance and negate the minuses.

  1. A budget device with a very good feature set.
  2. High-resolution color AMOLED touch display with 2.5D curved tempered glass.
  3. Extra touch button below the screen to act as back or screen on the button.
  4. Device is responsive with fast and accurate touch.
  5. Lightweight (22g only), compact and comfortable. You won’t even feel it on hand.
  6. Very good sunlight visibility as opposed to pathetic one in MI Band 3.
  7. Quite a good battery life. (detailed analysis below)
  8. Water-resistant up to 50 meters. So rain, underwater, pool, shower, etc won’t stop you. Tested it underwater and had no issues.
  9. Decent list of activities it can track, with swim mode auto recognition & GPS support via MI Fit app.
  10. Fast & fairly accurate heart rate sensor with 24×7 tracking with user-set interval.
  11. Sleep tracking with light, deep & sleep quality index.
  12. Virtually unlimited watch faces including custom photos for watch faces.
  13. 5-day weather forecast in band.
  14. Music control possible, play, pause, next, previous, volume +/-.
  15. Music controls work for YouTube videos also.
  16. Easy initial setup. Step by step instruction is below.
  17. Easy to use & well-organized interface.
  18. Autosync of data to MI fit app.
  19. Compatible with both Android & iOS devices.
  20. Replaceable strap to swap colors.
  21. Compatible with MI Band 3 straps.
  22. 5 Step adjustable screen brightness with night mode.
  23. It can be synced with google fit app.
  24. Flat-screen with 2.5D edges is less prone to scratches unlike MI band 3.
  25. Alarms created in-app are accessible via band. (on/off)


These are the only major negative points of the device you will find in this MI Band 4 review. Few issues are discussed in every section, if applicable.

  1. Every time for charging we need to remove the capsule from strap which is highly inconvenient. Any solution like the one in Honor Band will be highly appreciated.
  2. Frequent removal of the capsule will eventually loosen it in the strap (this may take months or maybe years), and someday you may find it accidentally missing from the strap.
  3. Snap-fit type strap looks cool but by design is less secure as compared to normal watch like strap where the strap goes inside buckle and is securely held there by a pin.
  4. As opposed to the Chinese version, there’s no mic or NFC here.
  5. Incompatible with MI Band 3 charging dock.
  6. Small charging cable.
  7. Proprietary charging dock with pogo pins. Micro USB would have been better as its handy. But maybe water resistance ate it up.
  8. No built in GPS but i think enough is already there.
  9. No built in camera control but geeks will be able to enable it.
  10. Sleep monitoring can’t be switched off to save battery.


  1. 6 workout modes: Treadmill, Exercise, Outdoor Running, Cycling, Walking, Pool Swimming (with laps, strokes & distance tracking)
  2. Regular Step counting, distance covered, calories burned, duration, etc
  3. Health monitoring
  4. Workout completion notifications, goal setting, targets, etc
  5. Automatic sleep monitoring
  6. Heart rate monitoring: all-day heart rate checking, resting heart rate, etc
  7. Water-resistant up to 50mtr so can easily be worn while swimming
  8. Idle alert or sedentary reminder (with start & end time)


  1. Vibration alarm (You can set any no of alarms, i tried to set 10 alarms & it worked. Just that band’s alarm interface becomes slow with many alarms)
  2. Call silent or reject
  3. Proximity sensor to switch off the display when you cover the full screen with palm or any object
  4. Pre-set & customizable watch faces
  5. Band lock screen
  6. Timer, stopwatch
  7. Notifications, incoming calls, message, calendar, apps, events, etc
  8. Weather forecast of up to 5 days
  9. Find phone
  10. Phone unlock
  11. Phone silent or normal mode from the band.
  12. Night mode, Do not disturb mode (works even without phone)
  13. Music controls to play, pause, next, previous, volume +/-
  14. Bluetooth broadcasting
  15. The band’s lock screen can be set to unlock band on swipe only.
  16. OTA updates
  17. Lift wrist to view info
  18. 5 steps adjustable brightness
MI Band 4 Interface & Screens
Band Interface


Pairing & initial setup of the band is as easy as 1,2,3. The band comes already charged & if you touch the button below the screen, it lights up & says “Pair First”. You just need to download the app (Android or iOS) & follow the instructions below:

Initial Setup of MI Band 4
  1. Turn on phones Bluetooth
  2. Open the app & click on + on top right or go to Profile → Add Device
  3. Select Band & allow the required permissions
  4. Bring the band closer to the phone
  5. When band vibrates, tap on tick mark to pair
  6. Paired message is displayed on the app. If available, band firmware will update automatically
  7. Continue & configure notifications, band preferences, etc
  8. Enjoy your device. It’s ready to use



  • Screen off


  • Go back
  • Wake band


  • Top to bottom to scroll downwards
  • Bottom to top to scroll upwards
  • Right to left to return to the previous page


  • Lift wrist to view info


  • No built in GPS but phone GPS can be used via the MI Fit app.
  • Max workout modes work without app connectivity, just that band won’t record route via GPS.
  • Cycling does not work without mobile connected. Like other modes, it informs that the route won’t be recorded but goes back to the main screen (maybe a glitch).
  • Every data is recorded in band & synced upon app connectivity.
  • Heart rate also recorded. Make sure to switch on “activity detection” for better accuracy if the frequency is set to higher values.
  • Music can’t be controlled while in workout mode. You need to stop it to be able to control music.
cycling workout in MI Band 4


  • Band automatically counts the steps & displays data in “status” entry
  • Steps, distance, calories, & idle alerts are shown
  • Step counting is fairly accurate. My 100 steps were counted as 109 by MI Band 4 & 107 by Honor Band 4
  • During night no steps count was there. Some band erroneously count steps during sleep also


  • Manual count of 660 steps
  • MI Band 4: 695
  • Honor Band 4: 684


  • Fairly accurate sensor.
  • Takes approx 20 s before showing current rate & then final avg at the end of the 60s
  • Heart rate detection modes: Automatic, Sleep assistant, Continuous (automatic + sleep assistant)
  • Detection frequency can be set, 1 or 5 or 10 or 30 mins
  • Activity detection can be set to auto increase frequency during workouts
  • Heart rate alert after 10 mins of set BPM. It won’t work if the frequency is set to 30 mins
  • Detailed data available in Fit app


  • Manual check: 87
  • Omron BP monitor: 86
  • MI Band 4: 91
  • Honor Band 4: 88
Hear Rate Tracking Comparison Omron BP Monitor, MI Band 4, Honor Band 4


  • Sleep tracking is automatic.
  • It records: bedtime, wake up time; deep sleep, light sleep, time awake, full sleep duration
  • Heart rate monitor can be set to sleep tracking mode or continuous mode for further accurate sleep data
  • Activating the above setting has a severe effect on the battery
  • No sleep data available in-band interface.
  • REM sleep data is also missing
  • No day time sleep tracking


Night 1:

  • Actual sleep 6 hrs 35 mins
  • MI Band 4: 7 hrs 30 mins
  • Honor Band 4: 6 hrs 42 mins

Night 2:

  • Actual sleep 6 hrs 30 mins
  • MI Band 4: 6 hrs 49 mins
  • Honor Band 4: 6 hrs 42 mins


  • Open notifications to view app notifications & messages
  • Notifications/msgs are displayed in reverse order as per the time of push
  • Swipe up to read them one by one
  • Once you reach the end of it, keep swiping to read the next notification/msg
  • Swipe down to delete all from the band
  • Multiple WhatsApp messages can also be read, one by one
  • It even displays 300-400 words WhatsApp message without any issue or lag


  • The band comes with few settings onboard while a big chunk can be configured using the MI Fit app
  • MI Fit app displays all of the data recorded from the band in the form of charts and graphs
  • Sleep data can only be viewed in-app but not in the band
MI Fit App Settings
  • MI Fit app can be set to sync with Google Fit via Profile -> Add accounts
  • All of MI Fit data, not just the one from the band will be synced with Google Fit


  • Make sure the MI Fit app has notification access. Without it, music controls won’t work
  • You can only control the music using the band, but not start it initially
  • If you just open the music app, & don’t play any song, it won’t work. “No music is playing”
  • Once you start the music, then you can fully control it
  • Pause, play, next, previous, vol +, & vol – works well. You can fast forward songs
  • Works flawlessly with all music apps like Prime, Spotify, Wynk, etc
  • Bonus is it works with Youtube videos also, with all controls
  • Doesn’t work with other video streaming apps


  • Displays 5 days weather forecast as per city set in Fit app
  • The first screen shows current day weather
  • Scroll screen to display the next 4 days forecast, 2 days at a time
  • Scrolling here was a bit laggy may be due to multiple scrolling texts in the 2nd & 3rd screen, “Tomorrow” & “Thunderstorm”.


  • Comes with BT 5.0 (low energy)
  • No frequent disconnections witnessed
  • The range is quite good at approx 40-50 ft without walls
  • Unlock mobile using the band via BT
  • Once out of range app displays disconnection
  • Once the band comes in range, app auto connects to it


  • 3 Builtin watch faces
  • A good collection is available via the Fit app
  • Custom watch face also supported with any photo from the gallery
  • Takes approx 15-20s to sync watch face to the band
  • Dedicated article for setting watch faces via band, MI Fit app & third party apps is here.


  1. Open MI Fit app
  2. Go to band display settings -> Custom, and select layout
  3. In the next screen, click on change background & select gallery
  4. Crop photo using any of available app
  5. Sync face to the band
  6. More details here
How to set custom watch face in MI Band 4

BATTERY LIFE (14 days to 25+ days)

There are various parameters affecting battery viz BT, Heart rate monitor, Screen on time, etc. Each having its own impact wrt on/off. So backup can vary by large means depending on usage pattern.

CHARGING TIME (0 to 100%) : ~1.5 hours via USB 2.0 Port
(Battery Capacity: 135 mAh, After 0%, the battery drained till auto-off, before charging)

COMPANY CLAIMS (Backup): 20 days


i) Full load, Everything “on”: 14 Days 6 Hours
– As per scaled data (26% drop in 96 hours)
– Heart rate, automatic + sleep assistant is “on”, 1 min frequency, activity detection “on”
– 20 min daily cycling
– Brightness full (level 5)
– Alarms (2), idle alerts, call & SMS alerts, Lift wrist to view info are on
– Night mode is off
– 24×7 connected to mobile

ii) Medium Load: 22 Days 5 Hours
– As per scaled data (18% drop in 96 hours)
– Heart rate in sleep assistant mode
– 20 min daily cycling
– Brightness full (level 5)
– Alarms (2), idle alerts, call & SMS alerts, Lift wrist to view info are on
– Night mode is off
– 24×7 connected to mobile

iii) Light Load: 26 Days 14 Hours
– As per scaled data (15% drop in 96 hours)
– Heart rate, automatic mode is “on”, 30 min frequency, activity detection “on”
– 20 min daily cycling
– Brightness full (level 5)
– Alarms (2), idle alerts, call & SMS alerts, Lift wrist to view info are on
– Night mode is off
– 24×7 connected to mobile

iv) Very Light Load, Everything “off”: 44 Days 10 Hours
– As per scaled data (9% drop in 96 hours)
– Heart rate monitor off
– No workout
– Brightness full (level 5)
– Idle alerts, SMS alerts, Lift wrist to view info is off
– Night mode (10 pm to 7 am), Alarms (2) are on
– Connect to mobile & sync to the app, once in a day


a) With everything off, as in you are using it as a watch, sleep & step counter. You get super max battery life.
b) Switch off “Lift wrist to view info” to save battery. As it will light up screen unnecessarily every time, even when you don’t desire to look at.
c) Switch of band discovery in settings.
d) Keep night mode on to save battery.


Having a screen guard looks tempting & is sometimes handy, but if you are careful enought you won’t need it. Even it affects the looks of the band. These devices are not meant to last forever, so enjoy till it lasts.

Another issue is due to the 2.5D screen. Already small screen with 2.5D curves, a guard won’t be able to cover full area and there will be gaps on the edge, which will look ugly. A similar issue is faced with 2.5D edges in mobiles.


Latest: v as on 21.09.2019

  • OTA updates are provided from time to time. First, it’s downloaded in the phone & then transferred to the band via BT
  • Received firmware update as soon as the device was connected
  • It takes 3-4 minutes for the process to complete
  • IT first updates resources & then the firmware
  • During the process, the band will display “updating” & nothing will work


In the above review of MI Band 4, i have discussed everything about this device but the comparison is a very critical part and the only thing left for now. So in short, Its a definitive upgrade for those with MI Band 3.

  • 0.95in 120x240px colour AMOLED screen in MB4 vs 0.78in 128x80px monochrome OLED in MB3
  • Awesome sunlight legibility in MB4 vs pathetic in MB3
  • Built in music controls in MB4 vs none in MB3
  • Battery 135 mAh vs 110 mAh in MB3
  • BT 5.0 in MB4 vs 4.2 in MB3
  • Unlimited & custom watch faces in MB4 vs few in MB3
  • Flat tempered glass above screen in MIB4 vs more scratch-prone oddly curved plastic one in MIB3


It’s a so so upgrade if you already have previous Honor Band 4 as it already has many of the features. Some extras in MI Band 4 are:

  • Music Control via Band in MB4
  • BT 5.0 in MB4 vs 4.2 in HB4
  • Unlimited watch faces in MB4 vs few in HB4
  • Flat-screen with 2.5D edges vs curved screen with 2.5D edges in HB4
  • Alarms created in-app are accessible via the band


This is the current trend and if you don’t have any band & are looking for one, then it’s important to check on both.

▶ Departments where MI Band 4 is better:

  • Premium looking band
  • Comfortable watch strap
  • Nothing specific to MI Phones
  • Slightly better battery life
  • Better spare strap availability due to MI’s own store
  • Custom watch faces (use your gallery photos in watch face)
  • “Always on” band, unlike Honor band where you have the option to power off the band & then if you’re without charging cradle, you cant switch it back on
  • Flat tempered glass screen with 2.5D edges, which is less prone to scratches
  • Alarms created in-app are accessible via the band
  • Cheaper

▶ Departments where Honor Band 5 is better:

  • True sleep mode with REM sleep tracking
  • SPo2 sensor to check oxygen levels in the blood
  • Sleep time breathing data
  • No need to remove the strap for charging
  • Normal watch like strap where the strap goes inside buckle and is securely held there by a pin
  • More workout modes (10, vs 6 in MB4 )
  • Accuracy here is slightly better in all domains


So with this, we are coming to the end of MI Band 4 review. Fitness tracking is getting crazy these days with every other person looking for a band. With the likes of MI, fitness tracking has gone to another level. Too much for too little. MI made it reach the hands of almost everyone looking for fitness tracking.


→ I already own MI band 3 & Honor Band 4. Comparing MB3 & MB4, MI band 4 is a definitive upgrade with a good set of new features. (comparison above)

→ If having Honor Band 4, the upgrade won’t matter much. Only upgrade if you want to have some extras, change of experience & different ecosystem. (comparison above)


→ If your budget is low & can ignore things quality & features discussed above, go for any cheap quality band.

→ If you can extend your budget, then definitely go for MI Band 4 without any second thought. It’s right now the best wearable available for the price.

→ If you can extend the budget further by a few hundred, then go for Honor Band 5, as its accuracy is slightly better & has more features.

→ If you are looking for serious activity tracking, then extend your budget further by 1000’s and get some serious fitness tracker. Remember these are budget devices & expect similar features & performance. Don’t expect wonders & get disappointed to rate them low.

So that’s the end of MI Band 4 review and if you like the device just get it without any second thought. For any issues or missing details feel free to comment here.

MI Band 4 Global: User Manual

MI Band 4

Get MI Band 4 from here: Amazon, MI Store

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