The door chime is not batteries or wiring is required with this door chime. The door button has a brass finish. • please note: this door chime works best for smaller homes, apartments, studios, or offices. It may be difficult to hear this chime from further than 30 feet away. • please note: the viewer does not go in the door button, but is installed separately on the door. WARNING: This product may expose you to chemicals known to the State of California to cause cancer or reproductive harm