Owners of modern activity trackers from Xiaomi often notice on the screen of their devices the acronym UVI, which can seem mysterious without the appropriate context. This parameter is displayed not by chance, it is directly related to the environmental monitoring functionality that is being implemented in the new models of the Mi Band. Understanding what exactly is hidden behind these three letters will allow you to more effectively manage your time in the sun and avoid negative consequences for the skin.
The acronym comes from the English term Ultraviolet Index, which means ultraviolet index. The UV index is the international standard for measuring the intensity of the sun's ultraviolet radiation near the Earth's surface. When your fitness bracelet shows this value, it actually tells you how dangerous or safe it is to be in direct sunlight at a given time.
Values can range from low to extreme, and ignoring high scores can lead to sunburn or heat stroke.The built-in algorithm synchronizes your location data with weather services via the Mi Fitness or Zepp Life app.This allows the gadget to display relevant information without having to take the smartphone out of your pocket while jogging or walking.
Technical significance of the ultraviolet index
To interpret the Mi Band data correctly, you need to understand the scale of measurements. UV light is divided into several categories, each of which requires a certain degree of protection. Low (0-2) usually does not require special precautions, since the risk of burn is minimal. However, even in cloudy weather, radiation can reach average values, as the device will notify you.
When the bracelet shows values in the range of 3-5, this is classified as an average risk level.At such times, it is recommended to wear a headdress and sunglasses, especially if you are outside between 10am and 4pm. Xiaomi gadgets such as Mi Band 6, Mi Band 7 and later, are able to warn the user in time to apply sunscreen.
⚠️ Attention: High Index values (6-7 At such times, the electronics of the device are operating normally, but ignoring warnings can lead to health problems.
Importantly, for this feature to work properly, the GPS module in a smartphone must be activated during synchronization. Without accurate geodata, the bracelet will not be able to get local weather and radiation information. Some users mistakenly believe that the sensor is built right into the body of the tracker, but most Xiaomi models use a network request via the phone.
- 🌞 0-2 (Low: No protection required, you can be in the sun without restrictions.
- ☂️ 3-5 (Medium: Requires protection in the midday hours, look for shadow.
- 🧴 6-7 (High: Need sunscreen, hat and long-sleeve clothing.
- 🚫 8-10 (Very high: Being in the sun without protection is extremely dangerous, burns are possible for the sun. 15 minute.
- ☠️ 11+ (Extreme: Being outdoors without protection is prohibited.
How to enable and configure UVI display
By default, the UV-index widget may be hidden or not activated in your tracker interface. To bring this information to the home screen, you need to use a companion app on your smartphone. The setup process is simple enough, but requires carefulness when choosing a dial, since not all dials support the output of this particular metric.
First, open the Mi Fitness app (or Zepp Life for older models) and go to your device profile. In the control menu, find the dial settings or dial store section. Here, it is important to choose a design that has a (special) weather or health unit, where the UVI value will be displayed.
Path to the menu: Profile → My tracker → Dial settings → ShopOnce you have a suitable dial installed, make sure that the app has permission to access the geolocation. Without this setting, there will be no synchronization of weather data, and instead of numbers, you can see the dashboards or the last known value. Also check if the "Constant Access" option is enabled in the location settings of your smartphone's operating system.
☑️ Customization of the widget UVI
If the data is not updated after all the manipulations, try restarting Bluetooth on your phone. Sometimes the operating system's background processes can block the transfer of data from weather services to the application, in which case re-pairing the device often solves the problem.
Synchronization problems and their solution
Despite Xiaomi Wear’s well-established algorithms, users may experience situations where the UVI score is not displayed or shows irrelevant data, most often due to an unstable Internet connection or malfunctioning of the weather servers the app accesses.
One common reason is aggressive battery optimization in MIUI or HyperOS shells. The system can kill the application's background process by deeming it inactive, which interrupts the transfer of weather data to the bracelet. To avoid this, you need to add the application to the exclusion list and allow auto-start.
| Problem. | Probable cause | Decision |
|---|---|---|
| UVI not updated | GPS is off. | Enable geolocation on the phone |
| Incorrect data | Time zone change | Reconnect Bluetooth |
| Widget's gone. | Change of dial | Select a dial with UVI support |
| No connection. | Lockdown of OS | Disable energy savings for the application |
Also, consider that some custom dials created by third-party developers may contain software errors. If you notice that the problem appeared immediately after changing the screen design, try going back to the standard dial from the manufacturer, which will help determine whether it is the theme program code or the system.
Hidden settings in the engineering menu
Weather impact on data accuracy
It's worth noting that a fitness bracelet doesn't measure UV light on its own using physical sensors on the housing (with the rare exception of specialized models) and relies on data from weather stations that may have errors. For example, if you're in a gorge, in the shade (tall buildings) or under a dense tree canopy, the actual radiation level will be lower than the general index for your area shows.
Cloudiness is also important: up to 80 percent of UV radiation can penetrate clouds, so the readings on the Mi Band screen on a cloudy day can be unexpectedly high. It's not a device error, but a feature of the physics of propagation. UV-rays.
⚠️ Attention: Snow, water and sand reflect ultraviolet light, increasing its impact. If you are on the beach or in the mountains, trust the readings of the gadget even in cloudy weather.
In addition, the app updates data at a certain frequency, usually every 30-60 minutes, to save battery power of the smartphone and the tracker itself. So instant change in numbers when the weather changes, data lag is normal behavior for energy-saving devices of the class of IoT.
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To get the most accurate data about the weather and UVI before going for a run, forcefully open the Mi Fitness application and wait for the update of the main screen.
Energy consumption and sensor operation
Many users worry that constant UV monitoring and frequent weather synchronization can quickly land the bracelet battery. However, as mentioned earlier, the tracker itself does not conduct continuous measurements. The main work on requesting data is taken by the smartphone, and the Mi Band comes ready packet of information.
Energy consumption for displaying the value UVI It's minimal on the screen, and it's comparable to the time or steps, and it's more powerful when you're notifying the vibration, if you've set up the high-radiation warnings, and the vibrator motor consumes more energy than the vibrator. OLED-display.
If you notice that the bracelet starts to discharge faster after all the weather widgets are activated, try reducing the refresh rate of the screen or the brightness of the backlight, which affects autonomy much more than the background synchronization of health data.
- 🔋 Always-On: Main energy consumer, turn off at low charge.
- 📶 Bluetooth: Unstable connection makes the device look for the phone more often.
- 💡 Brightness: Automatic adjustment helps save charge in the room.
- 📲 Notifications: Frequent vibrations from apps reduce uptime.
Xiaomi Model Comparison and Feature Support
The UVI display functionality is not available on all models the same. Older versions of trackers, such as the Mi Band 3 or early versions of the Mi Band 4, may not support this feature due to software limitations or the lack of compatible dials. With the release of the Mi Band 5 and newer support, it became the standard for most regions.
It is important to distinguish between software support and physical sensors. None of Xiaomi’s mass-market models currently have a built-in physical ultraviolet sensor (UV Sensor), all of which are geolocation-based calculations, which makes it different from the high-end specialized sports watches that such sensors can have.
⚠️ Note: If your device has a function UVI It worked, and when the firmware update is gone, check the changelog, sometimes manufacturers remove features in certain regions or change weather data providers.
When choosing a new device, pay attention to screen size and resolution, as on small displays of older models, information about the UV index can be displayed unreadable or occupy the entire screen, overlapping other important metrics.
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UVI on Xiaomi Mi Band is a software feature that depends on the smartphone and the Internet, and not the result of the physical sensor on the bracelet.