Siemens OH921 Multi-Criteria Intelligent Fire Detector

The Siemens OH921 is a plug-in, addressable, two-wire and multi-criteria detector (with both photoelectric and thermal inputs) compatible with FireFinder XLS systems. Compatible with device programmer / loop tester, Model DPU COMPATIBLE MOUNTING BASES: — DB-11 Detector Mounting Base — ADBX-11 Audible Base — DB-X11RS Relay Base p/n S54320-F6-A2