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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
== Products ==
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[[File:System Sensor L-Series Speaker Strobe.jpg|thumb|L-Series speaker strobe.]]
In 2017, the System Sensor L-Series was released, replacing the SpectrAlert Advance series.{{Citation needed|date=April 2024}} New features included a new 3000 hertz tone, more candela options, lower power draw, and an updated design. The low frequency devices were released in 2018. The new low frequency devices had Temporal 4 for Carbon Monoxide (CO) operations. In October of 2023, System Sensor announced the release of a new LED L series that uses lower current draw, which would replace the Xenon L-Series devices; the latter was discontinued as of late 2023.<ref name=":0" /> Some L-Series low frequency sounders have been recalled on March 14, 2024. <ref>{{Cite web |date=March 11, 2024 |title=Operational issues on the System Sensor Low Frequency Sounder models |url=https://buildings.honeywell.com/content/dam/hbtbt/en/documents/document-lists/system-sensor/recall-notifications/SSR24.1SB%20-%20System%20Sensor%20Low%20Frequency%20Sounder%20Notice%20with%20DEALER%20Certificate%20of%20Complicance.pdf |archive-date= |access-date=May 16, 2024 |website=System Sensor}}</ref>
'''L-Series LED'''
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