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System Sensor 4WT-B
Category : System Sensor
This 4-wire smoke detector also has a thermal heat sensor.

Gentex GMS24-15/75WR
Category : Gentex
The horn mechanism on this alarm is the exact same one as found on the rectangular electro-mechanical Simplex horn/strobes, such...

Wheelock RSSWP-2475W
Category : Wheelock
This alarm has a weathered strobe, unlike my other Wheelock RSSWP-2475.