Fire-Lite's CP355 addressable, low-profile, plug-in ionization detector uses a state-of-the-art ionization sensing chamber to provide open-area protection and is used exclusively with Fire-Lite’s MS-9050UD, MS-9200UDLS, and MS-9600 addressable Fire Alarm Control Panels. The ionization detector is used to sense products of combustion and report the measured level of such product to the panel.