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Once a person’s identity is announced through the door phone, a phone user enters a special code which allows the door to open. The ADP-40 offers a weather-resistant design that is easy to install in new or existing construction. It fits flush in any single gang electrical box and receives power directly from the telephone line. With weather and vandal resistant features that include an 18- guage stainless steel faceplate, Mylar speaker, hex drive mounting screws, a stainless steel speaker scree