Siemens smoke-detector accessory, Model ADBH-11, combines detector-base and audible-device functions. Typical applications for use of Model ADBH-11 include: dormitories, hotels, motels, apartments, etc. ADBH-11 meets the audibility requirements for smoke alarms as specified in UL217: ‘Single and Multiple Station Smoke Alarms.’ The Siemens ADBH-11 Audible Detector Base is designed to be used with conventional Series 11 plug-in detectors.