The DBI-2 Doorbell Interface provides pleasant doorbell chimes throughout a home installed with a Niles MultiZone or other compatible music system. External contact closure and voltage triggers (for both a front and rear door) are combined with a programmable trigger tone/delay to integrate with Niles MultiZone and similar control systems. The DBI-2 includes a choice of four pre-recorded and two custom recordable chimes to provide the appropriate doorbell chime for any home. A UL-listed, universal voltage power supply is included for your convenience.