The Siemens – Fire Safety Intelligent Test Switch Module (Model TSM-1X) is a key- activated (T-45), addressable normally open (N.O.) momentary switch with a tri- color light-emitting diode (LED) indicator. The tri-color LED mimics the status of the associated Siemens smoke detector or compatible device(s). Each Model TSM-1X switch can be configured to test and monitor group of devices, using one (1) address on the fire-alarm control panel (FACP) loop.