Intercom systems have an outside station at the gate and a monitor or handset inside the house. The intercom is like a “door bell” which allows you to communicate with your visitor before pressing a button to allow access. There are different models of intercom including a basic one button outside station to one handset, up to colour monitors and several button outside stations which allows different areas of a property to be called. The outside station can be mounted on an exterior wall or on a gooseneck so a car can drive up to the intercom and ring the bell.