Why do password fingerprint locks need to be equipped with mechanical keys？

In fact, this is from a safety perspective. Electronic smart locks sold in China must be equipped with a mechanical key. As an emergency unlocking method under special circumstances, smart door locks without a mechanical key cannot leave the factory. When you encounter a smart door lock running out of power, you can use a mechanical key to unlock it. When a faulty fingerprint, password, mobile phone, etc. cannot be opened, you can use a mechanical key. In an emergency such as a fire, the high temperature will cause the smart door When the lock fails, the mechanical key will come in handy~