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Mi Smart Band 4- India's No.1 Fitness Band, Up-to 20 Days Battery Life, Color AMOLED Full-Touch Scre and Earphone Basic with Ultra deep bass & mic (Blue)

4.3 out of 5 stars 90,408 ratings

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Design: Mi Band 4 + Earphone Basic (Blue)
Mi Band 4 + Earphone Basic (Blue)
Updated other options based on this selection
Brand MI
Style Minimalist
Colour Black
Special Feature Sleep Monitor, Notifications
Target Audience Unisex Teen, Unisex Adult

About this item

  • The Mi Smart Band 4 features a 39.9% larger (than Mi Band 3) AMOLED color full-touch display with adjustable brightness, so everything is clear as can be. Compatible with Android 4.4 or later/iOS 9.0 or later. Water-resistant at a depth of up to 50m
  • With music control on the band you can change the song, increase/decrease the volume and groove on without even touching your phone
  • With a sturdy 5ATM waterproof built, you can now take your band for a swim. It auto detects your swim style and captures 12 detailed data points for tracking. Connectivity - Bluetooth 5.0
  • Health and wellness tracking at its best with 24/7 automatic heart rating monitoring and alerts to warn you when the heart rate is high
  • Tangle free cable
  • Ultra deep bass
  • Has mic and play/pause button
  • High quality silicone earbuds
See more product details
This combo pack contains 2 items (may be delivered separately)
(90,408)
  • With a sturdy 5ATM waterproof built, you can now take your band for a swim. It auto detects your swim style and captures 12 detailed data points for tracking. Connectivity - Bluetooth 5.0. Resolution:120 x 240 RGB
  • Start your day right by understanding your sleep pattern with accurate light and deep sleep monitoring
  • The Mi Smart Band 4 features a 39.9% larger (than Mi Band 3) AMOLED color full-touch display with adjustable brightness, so everything is clear as can be. Compatible with Android 4.4 or later/iOS 9.0 or later. Body material:Polycarbonate
  • Up to 20 days of long lasting battery life for uninterrupted performance
  • With the band on your wrist, you can receive text messages, silence or reject calls, and get social media notifications instantly
(119,994)
  • Ergonomically angled to fit perfectly in your ear canal that provides long lasting comfort for every day usage.
  • Features 1.25 meter long cable & L-shaped 3.5mm jack to connect with your phone. Due to the L-shape, the connector will deliver a strong & durable life. Earphones are compatible with Android, iOS & Windows devices with jack.
  • Powerful 10 mm drivers & aluminum sound chamber for super extra bass and clear sound for the best music & calling experience.
  • High-quality silicone earbuds, which are gentle on skin without compromising the comfortable fit on the ears.
  • In-line microphone with a durable multi-function button to play/pause your music, and answer/end your calls, all with just one tap.
  • Speaker impedance: 32Ω ; Rated power: 5mW

What is in the box?

  • 1 N fitness tracker, 1 N black strap, 1 N charging cable, 1 N user manual
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    Mi Smart Band 4- India's No.1 Fitness Band, Up-to 20 Days Battery Life, Color AMOLED Full-Touch Scre and Earphone Basic with Ultra deep bass & mic (Blue)


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    Customer reviews

    4.3 out of 5 stars
    4.3 out of 5
    90,408 global ratings

    Top reviews from India

    Reviewed in India 🇮🇳 on 22 September 2019
    Verified Purchase
    Customer image
    5.0 out of 5 stars A band you wont regret for price & features | Detailed Review | Guide | Tips | MIB4 vs MIB3 vs HONB4
    Reviewed in India 🇮🇳 on 22 September 2019
    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. Find comparisons at the end.

    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 via Amazon Profile Page.

    UPDATE 12/10/19: Detailed battery backup analysis with 4 scenarios below. Upto 44 days battery backup! ⚡ ⚡

    ••••••••••••••
    📜 INDEX
    ••••••••••••••
    A) Initial views, Inbox, About device, Pros, Cons
    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

    •••••••••••••••••••••••
    💭 INITIAL VIEWS
    •••••••••••••••••••••••
    Having this device in hand feels good. Nice finish, color display (a first for MI Band series), premium looks (i prefer strap of MI band over Honor), comfortable strap, etc. There is a lot inside. There are a few hiccups too, but they can easily be ignored at this price point. So let's dive into the details.

    ••••••••••••••
    🎁 INBOX
    ••••••••••••••
    → MI Band 4 capsule
    → Black wrist strap
    → Charging cradle with pogo pins & fixed USB cable (6 inches long)
    → Mini user guide

    ••••••••••••••••••••••••
    🅰 ABOUT DEVICE
    ••••••••••••••••••••••••
    → 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-star device

    •••••••••••••
    ➕ PROS
    •••••••••••••
    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. Impressive 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.
    10. Decent list of activities it can track, with swim mode auto recognition & GPS support via MI Fit app.
    11. Fast & fairly accurate heart rate sensor with 24x7 tracking with user-set interval.
    12. Sleep tracking with light, deep & sleep quality index.
    13. Virtually unlimited watch faces including custom photos for watch faces.
    14. 5-day weather forecast in band.
    15. Music control possible, play, pause, next, previous, volume +/-.
    16. Music controls work for YouTube videos also.
    17. Easy initial setup. Step by step instruction is below.
    18. Easy to use & well-organized interface.
    19. Autosync of data to MI fit app.
    20. Compatible with both Android & iOS devices.
    21. Replaceable strap to swap colors.
    22. Compatible with MI Band 3 straps.
    23. 5 Step adjustable screen brightness with night mode.
    24. Can be synced with google fit app.
    25. Flat-screen with 2.5D edges is less prone to scratches unlike MI band 3.
    26. Alarms created in-app are accessible via band. (on/off)

    •••••••••••••
    ➖ CONS
    •••••••••••••
    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.

    •••••••••••••••••••••••••••••••••••••••••••••••
    🧰 FEATURES AS ACTIVITY TRACKER
    •••••••••••••••••••••••••••••••••••••••••••••••
    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)

    ••••••••••••••••••••••••••••
    🧰 OTHER FEATURES
    ••••••••••••••••••••••••••••
    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 +/- for music on the phone
    14. Music controls also work for YouTube videos
    15. Bluetooth broadcasting
    16. Band lock screen can be set to unlock band on swipe only.
    17. OTA updates
    18. Lift wrist to view info
    19. 5 steps adjustable brightness
    20. All notifications are displayed in the form of screen animation & vibration
    21. Custom vibration pattern can be defined via app in many places

    ••••••••••••••••••••••
    🛠 INITIAL SETUP
    ••••••••••••••••••••••

    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:

    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

    •••••••••••••••••••••••••••••••
    ✌ GENERAL GESTURES
    •••••••••••••••••••••••••••••••

    ▶ COVER FULL SCREEN
    - Screen off

    ▶ TOUCH BUTTON
    - Go back
    - Wake band

    ▶ SCREEN SWIPE
    - Top to bottom to scroll downwards
    - Bottom to top to scroll upwards
    - Right to left to return to the previous page

    ▶ BAND
    - Lift wrist to view info

    ••••••••••••••••••••••••••••••••
    🏋 WORKOUT SESSIONS
    ••••••••••••••••••••••••••••••••

    - 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.

    ••••••••••••••••••••••••••••••••••••••••••••••••
    🔢 PEDOMETER OR STEP COUNTING
    ••••••••••••••••••••••••••••••••••••••••••••••••

    - 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

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

    •••••••••••••••••••••••••••••••••
    💗 HEART RATE SENSING
    •••••••••••••••••••••••••••••••••

    - 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

    TEST
    - Manual check: 87
    - Omron BP monitor: 86
    - MI Band 4: 91
    - Honor Band 4: 88

    •••••••••••••••••••••••••••
    💤 SLEEP TRACKING
    •••••••••••••••••••••••••••
    - 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
    - No REM sleep data
    - No day time sleep tracking

    TEST
    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

    •••••••••••••••••••••••••••••••••••••••••••••••••••••
    ✉ NOTIFICATIONS & MESSAGE THREADS
    •••••••••••••••••••••••••••••••••••••••••••••••••••••

    - 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

    •••••••••••••••••••••••••••
    🎵 MUSIC CONTROL
    •••••••••••••••••••••••••••

    - ⏯⏮⏯ 🔉🔊 Pause, play, next, previous, vol +, & vol - works well. You can't fast forward songs
    - 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
    - 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

    ••••••••••••••••••
    ⛅ WEATHER
    ••••••••••••••••••

    - 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

    ••••••••••••••••••••••
    📶 BLUETOOTH
    ••••••••••••••••••••••

    - 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 & band displays disconnection
    - Once the band comes in range, app auto connects to it

    •••••••••••••••••••••••
    ⌚ WATCH FACES
    •••••••••••••••••••••••

    - 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

    ▶ SET CUSTOM PHOTO WATCH FACE
    - Open MI Fit app
    - Go to band display settings -> Custom, and select layout
    - In next screen, click on change background & select gallery
    - Crop photo using any of available app
    - Sync face to the band

    ••••••••••••••••••••••
    🔋 BATTERY LIFE
    ••••••••••••••••••••••

    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

    ▶REAL-WORLD USAGE (Backup) (Brightness full level 5 in all cases)

    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
    - Alarms (2), idle alerts, call & SMS alerts, Lift wrist to view info are on
    - Night mode is off
    - 24x7 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
    - Alarms (2), idle alerts, call & SMS alerts, Lift wrist to view info are on
    - Night mode is off
    - 24x7 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
    - Alarms (2), idle alerts, call & SMS alerts, Lift wrist to view info are on
    - Night mode is off
    - 24x7 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
    - 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

    ▶ GENERAL INSIGHTS & TIPS

    a) With everything off, as in you are using it as a watch & step counter. Though this defies its sole purpose, 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

    •••••••••••••••••••••••••••••••••••••••
    📱 SCREEN GUARD YES OR NO
    •••••••••••••••••••••••••••••••••••••••

    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.

    Also, 2.5D is responsible for accidental peel off of the protector as bands swipe across a lot of things (esp non-scratching ones like clothing, persons, pillow during sleep, etc). I lost two screen protectors from Honor band 5 in a similar way, after which i stopped using these on bands.

    ••••••••••••••••••••••••••••••
    📲 FIRMWARE UPDATE
    ••••••••••••••••••••••••••••••

    Latest: v 1.0.6.16 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

    ••••••••••••••••••••••••••••••••
    MI BAND 4 vs MI BAND 3
    ••••••••••••••••••••••••••••••••

    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

    •••••••••••••••••••••••••••••••••••••••
    MI BAND 4 vs HONOR BAND 4
    ••••••••••••••••••••••••••••••••••••••

    It's a so so upgrade if you already have previous Honor Band 4 as Honor Band 4 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

    •••••••••••••••••••••••••••••••••••••••
    MI BAND 4 vs HONOR BAND 5
    •••••••••••••••••••••••••••••••••••••••

    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

    ••••••••••••••••
    🏆 VERDICT
    ••••••••••••••••

    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.

    There are a few minor issues here & there, wrt accuracy & software glitches which can be fixed in fw updates.

    ▶ 🆙 UPGRADING?

    → 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)

    ▶ 🆕 NEW TO WEARABLES?

    → 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.
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    Reviewed in India 🇮🇳 on 2 March 2020
    Verified Purchase
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    5.0 out of 5 stars Nice
    Reviewed in India 🇮🇳 on 2 March 2020
    DETAILED REVIEW with Comparison with Honor Band 5, Battery Performance stats,etc
    NOTE:
    @ Music control feature can be used to Control the music of default as well as 3rd party apps.
    @ Straps of MI band 3 also fit this MI band 4 perfectly.
    @ Has awesome battery backup of 20+ days ( check the review for Detailed Battery backup )
    @ Though there's sleep tracking feature in this band, but there's NO Sleep tracker TAB to view data on Band itself in Indian version as well.

    UPDATE ( 29/09/2019 ) - Honor band 5 now has got SpO2 & Music control feature via firmware update. So now honor band 5 has better edge over MI Band 4 and only plus point MI band 4 has now is better battery backup. So I would now recommend buying Honor band 5 rather than MI band 4, as honor is more accurate. Still if you want to buy MI band 4, then you can read the rest of Original review.

    UPDATE ( 27/09/2019 ) - There's addition of a 4 Digit Screen Lock. Which is automatically activated when the band is removed from the wrist and you will need to enter that set code to unlock. And in case you forgot the code, then you can turn it off via app by pairing with the band.
    Honestly, I don't understand why even such feature is pushed to the band, its useless according to me. Instead, adding more exercises and day-time sleep tracking would have being more practically helpful to users !

    This is very long review divided into 3 parts namely, Quick Overview, Full Detailed review and Comparison of it with Honor Band 5. So if you are really looking to invest 2300 rupees, then I highly advice to read it completely, to ease your decision.

    ●● If you want to get quick overview of the device, then read below else scroll down for Detailed Review ●●
    # The Screen is Full Touch Coloured AMOLED with 2.5D slightly curved at the edges.
    * Brightness is Adjustable.
    * It is prone to shatter if falls on face.
    # Has awesome Battery backup of 20+ days on normal usage and upto 12+ days on Heavy use.
    # Its very Light weight and compact.
    # The Strap is extremely comfortable and also replaceable.
    * This time MI have improved the strap design by giving deeper grooves, which will avoid accidental fallouts.
    # Has Full Whatsapp, Instagram, Message, Call, etc Notification alerts.
    # Music control feature can be used to Control the music of default as well as 3rd party apps.
    # Updates are not very Frequent.
    # Connects to both android and iOS, without any problem.
    # Has Customizable watch faces via default app and 3rd party installation is also possible.
    # Watch interface is Clean and easy to use.
    * But there's NO sleep tracker TAB on the band. For that you have to use App.
    # Has averagely accurate built-in Continuous Heart Rate monitoring and Sleep Tracker and Highly accurate Pedometer.
    # It is swimming safe as well, but touch panel is useless once water touches the screen.
    * You will have to dry wipe the screen for proper touch functioning.
    # Charging dock is different from MI band 3, so NO interchangeability.
    # Finally its affordable.

    Full Detailed Review :--

    ● DESIGN ●
    -------------
    # It have slim profile and 0.95" 2.5D display surrounded by black bezels perfectly blends in.
    # It is extremely Light as well.
    # It has Circular Touch sensitive Touch button, which is almost invisible.
    * But its NOT Home button. It is just back button, which is not very handy.
    # It has 2 pin contact charging dock facing down, still the capsule needs to be taken off from the straps for charging !
    # Finally Quality of the strap is same as previous versions and feels comfortable.
    * Except the grooves on straps are deeper now, which avoids accidental fallouts of capsule module.

    ● DISPLAY ●
    --------------
    # It sports 0.95" AMOLED Colour display which gives crystal clear output ( same as Honor band 4 & 5 ).
    # The display module is Rectangular with Vibrant colours and Bright Light (Adjustable upto 3 Levels).
    # Its very responsive and has good readability even in direct sunlight as well.

    ● FEATURES ●
    ----------------
    It has 6 Main modes namely Daily activity tracker, Heart Rate sensor, Workout, Weather, Notifications and More (settings)
    # In Activity tracker, complete pedometer and calories details of the day are mentioned.
    * Its 95% accurate according to my usage.

    # In Heart rate sensor, you can quickly check the heart rate and it displays it in continuous manner for few seconds before it stops.
    * Its very SLOW heart rate tracker and NOT very accurate as well.
    * You can even set heart rate tracking on Continuous mode from the app.

    # This band has Sleep tracking feature, but NO sleep tracker data TAB on band itself.
    * To check the data you need to use the app.
    * It DOES NOT tracks the day-time sleep data.
    * Its decently accurate sleep tracker.

    # In Workout mode, there are many in-built modes like walking, running, swimming, free exercise, Cycling and treadmill.
    * There's NO GPS in the band, but you can track your session with GPS if connected with phone while that session.
    * Note that, you don't need to carry you phone while workout session, if you don't need GPS data.
    * There's continuous heart rate tracking in any workout mode.

    # In weather tab, you get to see the current day weather of your location.
    * There's also full week's forecast in it.

    # In Notification option, you can check all your smartphone notifications when connected to it.
    * It supports phone message, whatsapp messages, etc. And you can read the complete message.
    * It also supports call notifications, which has call Rejection and Silent option as well.
    * You also get direct notification and sedentary alerts on band without needing to check the message option.

    # In MORE, there are various micro settings and more features like Timer, stop watch, Watch faces, Reboot, etc.
    * Its very thoughtful to put extra settings or feature in the more option, so as to keep the interface clean.

    ● Watch Faces ●
    ------------------
    # There are out of the box 3-4 watch faces on the band.
    # Using the MI Fit app you can choose from more than 50 watch faces.
    # It also supports 3rd party watch face installation, which is a charm.

    ● Music Control ●
    --------------------
    # This is very useful feature when you are in workout session and listening to music on phone.
    # NOTE that, you can connect your MI band 4 & BT headset at the same time.
    # This feature can be used to control music playback of your PHONE ONLY.
    * There's NO music storage option on the band.
    # It works with default as well as 3rd Party music streaming apps as well.

    ● BATTERY PERFORMANCE ●
    ---------------------------------
    # It charges quite quickly from 0 to 100, within an hour.
    # With band not connected to bluetooth, not in continuous HR mode lasts more than 20 Days.( OFFLINE MODE )
    # With Bluetooth connected and Continuous HR mode, it lasts upto 15-18 Days.
    # If Fitness app is used for about a hour or more with REM Sleep ON, then it lasts upto 12 Days max.
    * I prefer to keep it bluetooth mode all the time and continuous HR mode, but Don't turn the REM sleep ON,
    by which I easily get upto 15 days of backup with 1 hour of workout mode used 6 days a week.

    ●● CONS ●●
    --------------
    # There's NO option to set screen lock time. Its fixed to 5 second and that's quite less.
    # Only 4 watch faces can be stored in Band, though band supports tons of faces via app.
    # Heart Rate sensor is very slow in tracking and not very accurate.
    # There serious Connectivity issue. Bluetooth only works when MI Fit app is ON.
    # Can't view Detailed Sleep tracking on the band itself. You will need the companion app for that.
    # To Turn the band ON every time, you need to connect charging dock to it.

    ●● COMPARISON with Honor Band 5 ●●
    ----------------------------------------------
    1. Design section -
    Honor band is more attractive than MI band due to its Curved display, when it comes to looks.
    Winner - Honor Band 5.

    2. Display section -
    Display of Honor band is slightly more brighter than MI band 4.
    Touch response is Better on MI band 4. Honor band has Laggy interface.
    Winner - MI Band 4.

    3. Pedometer & Workouts -
    Pedometer accuracy is almost same on both the bands.
    But there are twice as many workout modes on Honor band compared to MI band.
    Winner - Honor Band 5.

    4. HR Sensor -
    Heart rate sensor is 3 times more faster and highly accurate in Honor band 5 compared to MI band 4.
    * There are blackouts in Continuous HR measurement in MI band at times.
    Winner - Honor Band 5.

    5. Sleep Tracker -
    Sleep tracker of Honor band is undoubtedly much more accurate.
    Honor band also measures day time data, which isn't available on MI band 4
    Winner - Honor Band 5.

    7. Battery Backup -
    Battery backup is indeed better on MI band, almost double compared to honor band 5.
    Winner - MI Band 4

    8. Accessories -
    Replacement straps are easy to access on MI band and finding spares is also easy compared to honor band.
    Winner - MI Band 4

    9. Features -
    Features are even matched on both the bands.
    But Honor Band now has SpO2 sensor after update.
    Winner - Honor band 5 (*after update).

    10. Price -
    Almost same ( *after update )
    Winner - Both

    ●● VERDICT ●●
    -----------------
    In real world, if you are looking ONLY for Accurate fitness band, then Honor band should be your choice.
    If you are looking for style, features & customization, then MI band should be your choice.
    I personally think, if you are normal consumer like me and just need a decent fitness band, which can track your activities and give you rough estimates with awesome battery backup, then certainly go for MI Band 4.

    For those already owning MI Band 3, don't even have 2nd thought, this is worthy upgrade.
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