Bluetooth smart door locks use Bluetooth wireless technology, so you must turn on your phone's Bluetooth before you unlock it. The same is true when adding a lock device manager to open Bluetooth. Limited by the distance of the Bluetooth technology, this must be done before the lock. Usually, device pairing is required between two devices via Bluetooth transmission, but because the lock is not manual operation, an APP is required as a medium. The APP is usually provided by the developer of the lock, and there are two types of free use and paid use. . On the basis of turning on the Bluetooth, the smart door lock that needs to be used is bound by the mobile terminal APP. After the binding is completed, only the APP needs to be opened, and the lock interface that needs to be opened is clicked, and then the unlock icon is clicked to complete the unlocking.