The Xioami Mi Band 4 has infinite functions but they grow exponentially if we add to the set any of the many applications with the bracelet. In this way we can find new tricks and uses of the Xiaomi Mi Band 4 thanks to apps like Notify & Fitness for Mi Band , probably the best accessory for the bracelet.
We already know that the bracelet is able to measure our sleep, heart rate, record our sports activity and locate our lost mobile or replicate mobile notifications among many other things. Unfortunately, there are others that have not yet arrived in this version, such as payments by NFC, and that we hope will make an appearance on the Xiaomi Mi Band 5 . While that day arrives, we can add tools to the device such as the possibility of measuring fever with the Mi Band 4 .
We can do this by downloading the following application that was updated a few days ago in order to detect when the user’s keystrokes detect that something is not working well, anticipating the possibility of going through a feverish process.
How does the Xiaomi bracelet detect if we have a fever?
The Covid-19 pandemic is what has led to the development of the program to include the registration of symptoms that may indicate that you have a fever. The version of the application 9.0.6 that landed in the Google Play Store adds the support to measure fever in the Mi Band 3 and Mi Band 4 . To do this, the app uses the heart sensor included on the back of either bracelet.
If the heart rate increases at a rate greater than 8 beats per minute this could be an indication that we may have become ill and have a fever. Of course the medicine is done at rest and not in the middle of a sports activity since then we constipate before a false result. If while doing nothing increases the pulsations, it may be because we have a fever. 
At this point the application for the Mi Band 4 uses the application to issue alerts to the user if it detects abnormal behavior in the user’s keystrokes and allows us to anticipate if we are sick. Of course, the bracelet by itself is of no use as it only alerts you to the possibility of having a fever, something that we should check separately using the classic thermometer before the usual symptoms such as cold or headache even appear.
