Visitors can easily call and talk to the residents through the access control telephone in front of the unit door downstairs. The residents can control the opening and closing of the unit door indoors. The host computer of the community can receive the alarm signal of the residents at any time and send it to the indoor telephone to notify the users. The system not only enhances the security work of the high-rise residential building, but also greatly facilitates the residents and reduces many unnecessary trouble of going up and down the stairs.

The internal structure of the electronic control lock of the audio door telephone is mainly composed of the electromagnetic mechanism. As long as the user presses the electric lock key on the extension, the electromagnetic coil can be energized, so that the electromagnetic mechanism drives the linkage to move, and the door can be controlled to open. The door closer is a special automatic door closing linkage. It has an adjuster, which can adjust the acceleration and action force, and is convenient and flexible to use.