Audio / video door phone is a bidirectional communication device. This device allows a person who is in the room, to hear or see if there is a video, a man who wants to enter, to contact him, and only then decide whether or not to let him in.
Audio / video door phone is a bidirectional communication device. This device allows a person who is in the room, to hear or see if there is a video, a man who wants to enter, to contact him, and only then decide whether or not to let him in.
