OCSIN: 1 Name: Model 4R20C Port: 8/12 RPM: 3550 Manufacturer: Cyclone Siren Notes: The 4R20 stands for 4 RPMs as the rotation speed of the horn, the 20 is the ports added together, and C stands for coded. This siren is capable of Alert, Attack, Fire, and Pulse signals.
OCSIN: Orange County Siren Identification Number
