The addressable base sounder is a local-area alarm device designed for indoor use. It can be connected only to detection systems using Intellia detectors and Esmi Sense fire control panels with the appropriate software. The Intellia series of products are all compatible with the ALC2-board of an Esmi Sense fire control panel. The low volume range is useful where a fire alert is initially intended to warn staff only. ESI-20 is with a short circuit isolator. Includes a unique acoustic self-test. Individual address is set with DIL switch.