The Doorking 1802-082 is a Surface Mount Telephone Entry System, which can store up 600 phone numbers, Two special inputs can be programmed for relay activation or dial-out funciton. The DoorKing 1802-082 is ideal telephone entry systems that are loaded with features and are suited for applications that have limited space and can be used in residential as well as commercial applications. The DKS 1802-082 is designed for applications that do not require a directory, or in applications where a separate directory exist. Visitors are easily identified by voice communication and can be granted or denied access directly from a touch-tone telephone. The 1802-082 has stainless steel faceplate and galvanized steel sub-plate.