... to set up,Practical needs,Competitive factory price with high quality. LRK-3208 Intercom Features:Two indoor phone ... sound out You can pick up the phone to talk with the visitor.If necessary,you ... electric-lock will be opened automatically.Complete door phone system, surface mounting,,D-I-Y assembly ... protection, Delicate smart part, makes the door phone a saluting angel of dwelling house,work building, ...