The DB200 is both a wireless doorbell and telephone signaler and can be installed in seconds. The doorbell flash number can be customized for 5 or 10 flashes, and user can configure different patterns for the front and back door. The doorbell also has a chime for hearing members of the family. For telephone notification, plug the included telephone cord into an existing telephone jack, and the unit will flash different lights for the telephone or the doorbell.