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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. 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 Xenon L-Series was discontinued in Late-2023.
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