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==History==
System Sensor was founded in 1984<ref>{{cite web |title=About System Sensor |url=http://www.systemsensor.com/html/about.html |archive-url=https://web.archive.org/web/20100308105416/http://www.systemsensor.com/html/about.html |archive-date=March 8, 2010 |accessdate=24 October 2009}}</ref> to address the requirements of exclusive industry fire alarm products. Early products included the MASS and PA400 Series. The MASS was multi-tone and came in remote horn and horn strobe models as well as remote strobe models, and speaker strobes and remote speakers. The System Sensor PA400 is a mini horn., with an optional strobe attachment. In the 1990s, systemSystem Sensor updated the MASS with an ADA-complaint strobe. Around this time, System Sensor also had a line of smoke detectors, including the System Sensor 1400 2-wire Ionization detector and the 2400 2-wire Photoelectric detector. In 1997, the MASS was replaced with the SpectrAlert series, which included horn strobes, strobes, remote horns, chimes, chime strobes, speakers, and speaker strobes. A main feature of these was the ability to sync using a System Sensor MDL sync module or the System Sensor sync protocol on a supported FACP[[fire alarm control panel]]. There were multiple generations of the SpectrAlert. The 1stfirst gengeneration had a screw lock,. theThe 2ndsecond gengeneration, which came outreleased in the early 2000s, replaced the screw lock with a clip lock, and. sometimeApproximately before 2006, the 3rdthird gengeneration camewas outreleased with multi-candela strobes, and replaced the jumpers for the horn tone with [[DIP switch|DIP switches]]. Around the time of the 2nd and 3rd gen SpectrAlerts being distributed, System Sensor was acquired from Pitway by Honeywell. Around this time, System Sensor introduced the i3 line of smoke detectors, which came in 2 and 4 wire models. These devices have a feature which they will poll with the FACPfire alarm panel when the Sensorsensor is dirty, causing a trouble condition on the panel. In 2006, the original SpectrAlert series were replaced with the SpectrAlert Advance. It'sIts main features were aan updated mounting plate wiring design, allowing for easier installation, more candela options, and an updated design. The Advance came in the same models as the Classic with the addition of mini horns, and Low-frequency sounders, which were released circain 2014. In 2017, the System Sensor L-Series camewas outreleased. with the slogan "Less=More", newNew features included a new 3000hz3000 hertz tone, more candela options, lower power draw, and a new updated design. The LFlow frequency devices were released in 2018, and all advancesSpectrAlert Advance products, expect for the outdoor models and mini horns, were discontinued by February 2020. The new LFlow Devicesfrequency devices had Temporal 4 for Carbon Monoxide (CO) operations.{{citation needed|date=November 2022}}
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