Model HI121 from Siemens ─ Fire Safety is a thermal detector that comes with a new magnet-test feature. The magnet-test feature allows for Model HI121 to be tested without the use of a heat gun, providing quick testing for installers and test personnel to prove the integrity of the wiring and proper connection to the fire alarm control panel (FACP). An indication of supervision status is provided by Siemens Fire’s unique (3) three- color light-emitting diode (LED) provided locally on the detector ─ and optionally with the various remote LED indicators.