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