DKS 1504 Keypad and Intercom Access Control Entry System The model 1504 series is a small compact stand alone digital keypad unit WITH INTERCOM that is loaded with features. It combines the Model 1506 Keypad with an intercom sub-station. It is ideal for doors or gates. It's distinctive styling is ideal for small residential or commercial applications. They are vandal resistant and use stainless steel faceplates with galvanized steel subplates in a rugged steel cabinet. Standard units can be surface or flush mounted while flush mount units are made to be recessed into a wall or column. For stand-alone applications or for connection to an access controller. Keypad User's enter their 4-5 digit unique PIN (personal identification number) to gain entry. Intercom model 1504 combines the keypad with an intercom substation that can be used with some existing intercom systems.