what is a doorbell used for
Doorbell buttons: A convenient means of completing the circuit, located and mounted on the outside of an entrance to the home, may be used at one door or at 2 entrances. 2 wires are hooked to connectors of the button assembly, when the button is pushed, the contact is closed and thereby making an electrical connection between the 2 wires, and the connection is broken when the button is released.