But, unfortunately

When choosing an electronic lock for your front door, be sure to provide it with a power source. In the absence of such an opportunity, it is better to refuse to install an electric shock. The thing is that for effective operation such a mechanism requires a constant connection to the electric network. Of course, in special cases when the power is disconnected, the lock can work on the backup charge of the battery for some time. In this case, control and management of access to your home will not be violated. But, unfortunately, the supply of electricity will soon end, and the castle will cease to fulfill its main function.