Models ADB-11 and ADBX-11 are audible-base detectors that contain a pre-wired, audible and piezoelectric device that produces an 85db signal for localized annunciation. Model ADB-11 is designed to be used with conventional Series 11 plug-in detectors, and Model ADBX-11 is designed for use with addressable, analog Model FP-11 and Model FPT-11 detectors. Typical application includes all areas that normally would require localized, audible annunciation, such as: hotel, motel, apartment, condominium, and dormitory rooms.