Niles DBI-2 Door Bell Accessory Box Adds convenience and security to any Niles MultiZone System and other brands of multizone controllers with paging inputs. Plays Doorbell Chimes through multi-zone system. The DBI-2 includes 4 different doorbell sounds Audio Paging Input - Connect the DBI-2 to the output of a telephone paging system Chime and Audio Level Adjustments - The sound volume for the chimes and audio paging are independently adjustable allowing you to set the volumes to be equal. Native Support for Illuminated Doorbell Buttons - Adds convenience and security.