Xiaomi has released an update for the NFC version of the Mi Band 4 smart bracelet ( review ), in which one useful feature appeared.
What is known
The firmware added the ability to open the “smart” door lock MiJia Smart Door Lock using the built-in NFC-module. To do this, go to the application Mi Home, connect the two devices and use the Mi Band 4 as a key. Everything works very simply – attach the bracelet to the NFC tag of the lock and the door will automatically open.
Recall that Mi Band 4 with NFC is no different in performance from the regular version. It has a color OLED display of 0.95 inches and a battery with autonomy up to 15-20 days. The case of the device is protected from water (5ATM). The official cost of the bracelet in China is $ 33, but on Aliexpress it is sold for $ 50-55.