Anti theft door downstairs press door

If you only need to isolate the downstairs, there is no upstairs or the upstairs is your own home, you can directly seal the security door in the position of the stair step.

The following diagram shows the basic components of a single-user system. After the visitor presses the doorbell button on the outdoor unit, the indoor unit sends out a prompt bell, the householder goes off-hook, the system automatically starts the camera on the outdoor unit, obtains the video image of the visitor, and displays it on the screen of the indoor unit, at this time, the householder and the visitor can have a dialogue through the system, after the householder confirms, press the unlocking key, the electronically controlled door lock is opened, and after the visitor enters the door, the door is automatically closed, and an operation process is completed. If you can't negotiate the installation, you can bypass the user downstairs.

The doorbell has a key-shaped button. Press it to open the door.

Combination lock security doors are safer and more convenient than ordinary security doors. The lock of the combination lock security door has a numeric keypad to use electronic control, and when it is opened, a series of numbers are typed sequentially. The advantage is that you can simply tell the unlocker the code, and there is no need to copy the key, so the code of this type of combination lock needs to be changed frequently. >>>More

Uh, this is cowardice, many people are like this, what does it have to do with kidney deficiency, you are still young, don't be afraid.