Water resistant up to 50 meters²
With a 5ATM IP rating, the Mi Band 3 provides daily water resistance that allows you to wear it while swimming or surfing.
New secondary activity tracking screen3
Whether you're running, biking, or walking, you'll always know your heart rate, speed, etc. Monitor your physical status and adjust your exercise intensity to produce even better results.
Goal reminders
When you reach your target step count for the day, the Mi Band 3 will gently notify you that you've reached your goal, providing inspiration to become an even harder-working and more successful person.
Daily step count and heart rate monitoring4
Our step count algorithm was once again upgraded and improved, making sure that every hard-earned step is counted.
In addition, the heart rate sensor can accurately read changes in your heart rate over a 24-hour period. It can also detect your current heart rate.
Monitors sleep quality
Accurately records information about your sleep quality every night, including data on deep sleep and light sleep, helping you successfully adjust your sleeping habits.
Inactivity alerts
When you're too busy and lose track of time, the band will gently vibrate, reminding you to get up and take a walk. This helps improve your overall physical health.
Convenient password-free unlock5
When the associated Mi Band 3 is close to an Android phone, the phone can automatically unlock.
Incoming call display and call rejection
The all-new Mi Band 3 can display the name of a caller or the telephone number. If you don't want to answer, pressing and holding will reject the call.
The all-new Mi Fit App
Provides a complete range of support to help you get moving with the Mi Fit App, you can set customized daily goals based on your own personal needs, you can choose an exercise class that works for you, you can regularly check up on your weekly progress, you can view sleep data, and much more.
20-day battery life6
The body of the band only weighs 8.5 grams and contains a Li-Polymer battery with high energy density. Charge it once, and even with frequent use, the battery will last for over 20 days.
Secure design
A complementary two-tone color palette creates seamless beauty. In addition, after undergoing 2,000 durability tests,7 the Mi Band 3 remained firm and solid.
Three strap colors to choose from
The strap is made of thermoplastic elastomer,8 a soft material that allows for a more comfortable fit. There are three colors to choose from: graphite black, electric orange, and deep sky blue.
Notes:
1. The Mi Band 3 allows you to view the last 5 messages in your history. For every message, a maximum of 3 screens of content can be displayed.
2. Data sources: IP rating of 5ATM (equivalent to a water depth of 50 meters) is based on testing conducted by the National Quality Supervision Clock Inspection Center in accordance with GB/T 30106-2013, Report No. QT1803032. It can be worn in the shower, in the pool, or while swimming near the shore. It is not suitable, however, for saunas or diving.
3. When the Mi Fit App is set to athletic mode, monitoring your activity is quick and convenient. If you begin running outdoors or on a treadmill, riding a bike, or doing any kind of walking, you just need to lift your wrist. The screen of the Mi Band 3 will display key data in real time such as your time, mileage, heart rate, and speed.
4. The Mi Band 3 currently uses two different kinds of heart rate sensors. Therefore, the external structure looks slightly different. Rigorous testing conducted in the Huami Technology Laboratory has shown that factors like static heart rate, dynamic heart rate, and the band's overall performance are consistent. In addition, the 24-hour heart rate monitor can be opened in the Mi Fit App. This feature, however, consumes a fairly large amount of power, meaning it will reduce the overall battery life.
5. Support Android 4.4 and higher MIUI, or Android 5.0 and higher, plus Smart Lock compatible model.
6. The data on battery life is taken from testing conducted by the Huami Technology Laboratory using the following parameters: using factory default settings, receiving and displaying 50 message per day, having one alarm vibrate for 5 seconds, touching the button to display the time 10 times, spending 2 minutes on other operations, checking your measured heart rate 3 times, exercising for 1 hour per week (and activating the running function to monitor heart rate in real time while turning off heart rate notifications), and opening the Mi Fit App once a day to synchronize testing for data usage methods. During actual use, factors such as settings, operations, and the usage environment will have an impact on the battery life. These factors may cause results obtained during actual use to differ from lab data.
7. The Mi Band 3 wrist band has undergone manual simulation testing at the factory, including a cycle of 2,000 durability tests. The specific durability testing method involved loading the body of the belt from the front and removing it from the back, then loading the body of the belt from the back and removing it from the front. After being disassembled and reassembled, the wristband did not bear any noticeable signs of deformation or adhesive loss, and after the body of the belt was loaded, it was confirmed to be firm and solid.
8. The Mi Band 3 graphite black wristband has undergone SGS testing. It complies with GB/T 26572-2011 and EU RoHS environmental requirements, Report No. SHAEC 1800673601 and SHAEC1800673101. The Mi Band 3 electric orange and deep sky blue wristbands have been inspected by Bureau Veritas and comply with GB/T 26572-2011 and EU RoHS environmental requirements, Report No. (6618)110-1581/(6618)110-1582. The Mi Band 3 wrist band has also undergone biocompatibility testing conducted by the Anhui Provincial Institute for Food and Drug Test, Certificate No. AH2018-QZX-00005. During daily use, please avoid wearing the wristband too tightly, and keep the area between your wrist and the wristband dry. Also, please clean the wristband with water regularly. Please stop using the product immediately and seek medical assistance if the contact area on your skin begins to show signs of redness or swelling.

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Pros: Looks nice, comfortable, long battery life
Cons: Difficult to swipe and get to what you want to see.
Overall Review: Tracks heart beat, steps and sleep, nice app, but you have to take it apart to charge. It is also hard to swipe and see your steps.