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'''MASS Series'''
[[File:System Sensor MASS ADA.jpg|none|thumb|An [[Americans with Disabilities Act of 1990|ADA]] compliant version of the MASS]]
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 MASS series was originally sold under BRK Electronics and later under System Sensor. It featured a xenon flash tube housed under a translucent white plastic (Dubbed "Frosted Strobes" by enthusiasts). The original MASS series used break off tabs to change the tone meaning that once the tone is changed, it is permanent. The MASS series was later on updated to use jumpers rather than break off tabs. In 1993, System Sensor filed a patent for a new strobe that was ADA compliant. It featured a clear lens and a reflector to distribute the light as well as higher candela options, the minimum being 15 candela. Soon after, System Sensor
'''PA400 Series'''
The System Sensor PA400 was a mini horn, with an optional strobe attachment. In 2007, the PA400 series was discontinued and replaced with the MH series sold under the SpectrAlert Advance name.
'''SpectrAlert Series'''
[[File:System Sensor SpectrAlert Classic Horn Strobe.jpg|none|thumb|SpectrAlert Horn/Strobe]]
The SpectrAlert series was the successor to the MASS series. The SpectrAlert series included horn strobes, strobes, remote horns, chimes, chime strobes, speakers, and speaker strobes. A main feature of these alarms was the ability to sync them using a System Sensor MDL sync module or the System Sensor sync protocol on a supported [[fire alarm control panel]]. Three years after the initial release of the SpectrAlert series, System Sensor released the ceiling mount SpectrAlerts. This included horn strobes, remote strobes, speaker strobes, and remote speakers. There were multiple generations of the SpectrAlert. The first generation had a screw lock. The second generation, released in the early 2000s, replaced the screw lock with a clip lock. Approximately before 2006, the third generation was released with multi-candela strobes, and replaced the jumpers for the horn tone with [[DIP switch|DIP switches]]. In 2006, the original SpectrAlert series were replaced with the SpectrAlert Advance. A few years after the discontinuation of the SpectrAlert series, fire alarm enthusiasts dubbed the SpectrAlert series as "SpectrAlert Classic" indicating that it is the original SpectrAlert line of fire alarm products. The term became popular and is now being used by most fire alarm enthusiasts today.
'''SpectrAlert Advance Series'''
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