[2][3] System Sensor was founded in 1984[4] to address the requirements of exclusive industry fire alarm products.

[citation needed] The System Sensor PA400 was a mini horn, with an optional strobe attachment.

Approximately before 2006, the third generation was released with multi-candela strobes, and replaced the jumpers for the horn tone with DIP switches.

The Advance came in the same models as the original SpectrAlert, with the addition of mini horns, and low frequency sounders, which were released in 2014.

[citation needed] All SpectrAlert Advance products, except for the outdoor models and mini horns, were discontinued by February 12, 2020.

[citation needed] 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 and have a temporal 4 coding for carbon monoxide detection.

[citation needed] On November 19, 2020, System Sensor released two new ceiling-mount low frequency sounder devices.